diff --git a/ROMFS/px4fmu_common/init.d-posix/rcS b/ROMFS/px4fmu_common/init.d-posix/rcS
index 14b1c07a39a251bcecb88daee400aeaeb6b41ffd..9c0923a7e423778fee9f224c20290d3e7cdac828 100644
--- a/ROMFS/px4fmu_common/init.d-posix/rcS
+++ b/ROMFS/px4fmu_common/init.d-posix/rcS
@@ -94,18 +94,14 @@ then
 	param set BAT_N_CELLS 3
 
 	param set CAL_ACC0_ID 1376264
-	param set CAL_ACC0_XOFF 0.01
-	param set CAL_ACC0_XSCALE 1.01
-	param set CAL_ACC0_YOFF -0.01
-	param set CAL_ACC0_YSCALE 1.01
-	param set CAL_ACC0_ZOFF 0.01
-	param set CAL_ACC0_ZSCALE 1.01
 	param set CAL_ACC1_ID 1310728
-	param set CAL_ACC1_XOFF 0.01
+	param set CAL_ACC_PRIME 1376264
+
 	param set CAL_GYRO0_ID 2293768
-	param set CAL_GYRO0_XOFF 0.01
+	param set CAL_GYRO_PRIME 2293768
+
 	param set CAL_MAG0_ID 196616
-	param set CAL_MAG0_XOFF 0.01
+	param set CAL_MAG_PRIME 196616
 
 	param set CBRK_AIRSPD_CHK 0
 
diff --git a/src/modules/commander/PreflightCheck.cpp b/src/modules/commander/PreflightCheck.cpp
index 25e8d5b2ffbdb9ffaf77e2c87b9e5eefd5fc08b1..26fdc8d5a1d55db13e64a5f40526258c10326b5b 100644
--- a/src/modules/commander/PreflightCheck.cpp
+++ b/src/modules/commander/PreflightCheck.cpp
@@ -40,51 +40,40 @@
 * @author Johan Jansen <jnsn.johan@gmail.com>
 */
 
-#include <px4_config.h>
-#include <px4_posix.h>
+#include "PreflightCheck.h"
+#include "health_flag_helper.h"
+#include "rc_check.h"
 
 #include <parameters/param.h>
 #include <systemlib/mavlink_log.h>
-
-#include <drivers/drv_hrt.h>
-#include <drivers/drv_mag.h>
-#include <drivers/drv_gyro.h>
-#include <drivers/drv_accel.h>
-#include <drivers/drv_baro.h>
-#include <drivers/drv_airspeed.h>
-
+#include <uORB/Subscription.hpp>
 #include <uORB/topics/airspeed.h>
 #include <uORB/topics/differential_pressure.h>
 #include <uORB/topics/estimator_status.h>
+#include <uORB/topics/sensor_accel.h>
+#include <uORB/topics/sensor_baro.h>
+#include <uORB/topics/sensor_gyro.h>
+#include <uORB/topics/sensor_mag.h>
 #include <uORB/topics/sensor_preflight.h>
-#include <uORB/topics/system_power.h>
-#include <uORB/topics/vehicle_gps_position.h>
 #include <uORB/topics/subsystem_info.h>
+#include <uORB/topics/system_power.h>
 
-#include "PreflightCheck.h"
-#include "health_flag_helper.h"
-#include "rc_check.h"
-
-#include "DevMgr.hpp"
-
-using namespace DriverFramework;
+using namespace time_literals;
 
 namespace Preflight
 {
 
-static int check_calibration(DevHandle &h, const char *param_template, int &devid)
+static bool check_calibration(const char *param_template, int32_t device_id)
 {
 	bool calibration_found = false;
 
-	devid = h.ioctl(DEVIOCGDEVICEID, 0);
-
 	char s[20];
 	int instance = 0;
 
 	/* old style transition: check param values */
 	while (!calibration_found) {
 		sprintf(s, param_template, instance);
-		param_t parm = param_find(s);
+		const param_t parm = param_find_no_notification(s);
 
 		/* if the calibration param is not present, abort */
 		if (parm == PARAM_INVALID) {
@@ -92,12 +81,12 @@ static int check_calibration(DevHandle &h, const char *param_template, int &devi
 		}
 
 		/* if param get succeeds */
-		int32_t calibration_devid;
+		int32_t calibration_devid = -1;
 
-		if (!param_get(parm, &(calibration_devid))) {
+		if (param_get(parm, &calibration_devid) == PX4_OK) {
 
 			/* if the devid matches, exit early */
-			if (devid == calibration_devid) {
+			if (device_id == calibration_devid) {
 				calibration_found = true;
 				break;
 			}
@@ -106,47 +95,53 @@ static int check_calibration(DevHandle &h, const char *param_template, int &devi
 		instance++;
 	}
 
-	return !calibration_found;
+	return calibration_found;
 }
 
-static bool magnometerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional, int &device_id, bool report_fail)
+static bool magnometerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional,
+			    int32_t &device_id, bool report_fail)
 {
-	bool present = true;
-	bool success = true;
-	int ret = 0;
+	const bool exists = (orb_exists(ORB_ID(sensor_mag), instance) == PX4_OK);
+	bool calibration_valid = false;
+	bool mag_valid = false;
 
-	char s[30];
-	sprintf(s, "%s%u", MAG_BASE_DEVICE_PATH, instance);
-	DevHandle h;
-	DevMgr::getHandle(s, h);
+	if (exists) {
 
-	if (!h.isValid()) {
-		if (!optional) {
+		uORB::Subscription<sensor_mag_s> magnetometer{ORB_ID(sensor_mag), 0, instance};
+
+		mag_valid = (hrt_elapsed_time(&magnetometer.get().timestamp) < 1_s);
+
+		if (!mag_valid) {
 			if (report_fail) {
-				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO MAG SENSOR #%u", instance);
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG #%u invalid", instance);
 			}
 		}
-		present = false;
-		success = false;
-		goto out;
-	}
 
-	ret = check_calibration(h, "CAL_MAG%u_ID", device_id);
+		device_id = magnetometer.get().device_id;
 
-	if (ret) {
-		if (report_fail) {
-			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG #%u UNCALIBRATED", instance);
+		calibration_valid = check_calibration("CAL_MAG%u_ID", device_id);
+
+		if (!calibration_valid) {
+			if (report_fail) {
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: MAG #%u UNCALIBRATED", instance);
+			}
 		}
 
-		success = false;
-		goto out;
+	} else {
+		if (!optional && report_fail) {
+			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO MAG SENSOR #%u", instance);
+		}
 	}
 
-out:
-	if (instance==0) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_MAG, present, !optional, success, status);
-	if (instance==1) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_MAG2, present, !optional, success, status);
+	const bool success = calibration_valid && mag_valid;
+
+	if (instance == 0) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_MAG, exists, !optional, success, status);
+
+	} else if (instance == 1) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_MAG2, exists, !optional, success, status);
+	}
 
-	DevMgr::releaseHandle(h);
 	return success;
 }
 
@@ -173,6 +168,7 @@ static bool imuConsistencyCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s
 			set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_ACC, false, status);
 			set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_ACC2, false, status);
 		}
+
 		success = false;
 		goto out;
 
@@ -231,165 +227,155 @@ static bool magConsistencyCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s
 			set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_MAG, false, status);
 			set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_MAG2, false, status);
 		}
+
 		return false;
 	}
 
 	return true;
 }
 
-static bool accelerometerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional, bool dynamic, int &device_id, bool report_fail)
+static bool accelerometerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance,
+			       bool optional, bool dynamic, int32_t &device_id, bool report_fail)
 {
-	bool present = true;
-	bool success = true;
-	int ret = 0;
+	const bool exists = (orb_exists(ORB_ID(sensor_accel), instance) == PX4_OK);
+	bool calibration_valid = false;
+	bool accel_valid = true;
+
+	if (exists) {
 
-	char s[30];
-	sprintf(s, "%s%u", ACCEL_BASE_DEVICE_PATH, instance);
-	DevHandle h;
-	DevMgr::getHandle(s, h);
+		uORB::Subscription<sensor_accel_s> accel{ORB_ID(sensor_accel), 0, instance};
 
-	if (!h.isValid()) {
-		if (!optional) {
+		accel_valid = (hrt_elapsed_time(&accel.get().timestamp) < 1_s);
+
+		if (!accel_valid) {
 			if (report_fail) {
-				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO ACCEL SENSOR #%u", instance);
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL #%u invalid", instance);
 			}
 		}
-		present = false;
-		success = false;
-		goto out;
-	}
 
-	ret = check_calibration(h, "CAL_ACC%u_ID", device_id);
+		device_id = accel.get().device_id;
 
-	if (ret) {
-		if (report_fail) {
-			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL #%u UNCALIBRATED", instance);
-		}
+		calibration_valid = check_calibration("CAL_ACC%u_ID", device_id);
 
-		success = false;
-		goto out;
-	}
+		if (!calibration_valid) {
+			if (report_fail) {
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL #%u UNCALIBRATED", instance);
+			}
 
-#ifdef __PX4_NUTTX
+		} else {
 
-	if (dynamic) {
-		/* check measurement result range */
-		struct accel_report acc;
-		ret = h.read(&acc, sizeof(acc));
+			if (dynamic) {
+				const float accel_magnitude = sqrtf(accel.get().x * accel.get().x
+								    + accel.get().y * accel.get().y
+								    + accel.get().z * accel.get().z);
 
-		if (ret == sizeof(acc)) {
-			/* evaluate values */
-			float accel_magnitude = sqrtf(acc.x * acc.x + acc.y * acc.y + acc.z * acc.z);
+				if (accel_magnitude < 4.0f || accel_magnitude > 15.0f /* m/s^2 */) {
+					if (report_fail) {
+						mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL RANGE, hold still on arming");
+					}
 
-			if (accel_magnitude < 4.0f || accel_magnitude > 15.0f /* m/s^2 */) {
-				if (report_fail) {
-					mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL RANGE, hold still on arming");
+					/* this is frickin' fatal */
+					accel_valid = false;
 				}
-
-				/* this is frickin' fatal */
-				success = false;
-				goto out;
-			}
-
-		} else {
-			if (report_fail) {
-				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: ACCEL READ");
 			}
+		}
 
-			/* this is frickin' fatal */
-			success = false;
-			goto out;
+	} else {
+		if (!optional && report_fail) {
+			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO ACCEL SENSOR #%u", instance);
 		}
 	}
 
-#endif
+	const bool success = calibration_valid && accel_valid;
 
-out:
-	if (instance==0) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ACC, present, !optional, success, status);
-	if (instance==1) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ACC2, present, !optional, success, status);
+	if (instance == 0) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ACC, exists, !optional, success, status);
+
+	} else if (instance == 1) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ACC2, exists, !optional, success, status);
+	}
 
-	DevMgr::releaseHandle(h);
 	return success;
 }
 
-static bool gyroCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional, int &device_id, bool report_fail)
+static bool gyroCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional,
+		      int32_t &device_id, bool report_fail)
 {
-	bool present = true;
-	bool success = true;
-	int ret = 0;
+	const bool exists = (orb_exists(ORB_ID(sensor_gyro), instance) == PX4_OK);
+	bool calibration_valid = false;
+	bool gyro_valid = false;
+
+	if (exists) {
+
+		uORB::Subscription<sensor_gyro_s> gyro{ORB_ID(sensor_gyro), 0, instance};
 
-	char s[30];
-	sprintf(s, "%s%u", GYRO_BASE_DEVICE_PATH, instance);
-	DevHandle h;
-	DevMgr::getHandle(s, h);
+		gyro_valid = (hrt_elapsed_time(&gyro.get().timestamp) < 1_s);
 
-	if (!h.isValid()) {
-		if (!optional) {
+		if (!gyro_valid) {
 			if (report_fail) {
-				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO GYRO SENSOR #%u", instance);
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYRO #%u invalid", instance);
 			}
 		}
-		present = false;
-		success = false;
-		goto out;
-	}
 
-	ret = check_calibration(h, "CAL_GYRO%u_ID", device_id);
+		device_id = gyro.get().device_id;
 
-	if (ret) {
-		if (report_fail) {
-			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYRO #%u UNCALIBRATED", instance);
+		calibration_valid = check_calibration("CAL_GYRO%u_ID", device_id);
+
+		if (!calibration_valid) {
+			if (report_fail) {
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GYRO #%u UNCALIBRATED", instance);
+			}
 		}
 
-		success = false;
-		goto out;
+	} else {
+		if (!optional && report_fail) {
+			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO GYRO SENSOR #%u", instance);
+		}
 	}
 
-out:
-	if (instance==0) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GYRO, present, !optional, success, status);
-	if (instance==1) set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GYRO2, present, !optional, success, status);
+	if (instance == 0) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GYRO, exists, !optional, calibration_valid && gyro_valid, status);
 
-	DevMgr::releaseHandle(h);
-	return success;
+	} else if (instance == 1) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GYRO2, exists, !optional, calibration_valid && gyro_valid, status);
+	}
+
+	return calibration_valid && gyro_valid;
 }
 
-static bool baroCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional, int &device_id, bool report_fail)
+static bool baroCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, unsigned instance, bool optional,
+		      int32_t &device_id, bool report_fail)
 {
-	bool success = true;
+	const bool exists = (orb_exists(ORB_ID(sensor_baro), instance) == PX4_OK);
+	bool baro_valid = false;
 
-	char s[30];
-	sprintf(s, "%s%u", BARO_BASE_DEVICE_PATH, instance);
-	DevHandle h;
-	DevMgr::getHandle(s, h);
+	if (exists) {
+		uORB::Subscription<sensor_baro_s> baro{ORB_ID(sensor_baro), 0, instance};
 
-	if (!h.isValid()) {
-		if (!optional) {
+		baro_valid = (hrt_elapsed_time(&baro.get().timestamp) < 1_s);
+
+		if (!baro_valid) {
 			if (report_fail) {
-				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO BARO SENSOR #%u", instance);
+				mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: BARO #%u invalid", instance);
 			}
 		}
-		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ABSPRESSURE, false, !optional, false, status);
-		return false;
-	}
 
-	device_id = -1000;
 
-	// TODO: There is no baro calibration yet, since no external baros exist
-	// int ret = check_calibration(fd, "CAL_BARO%u_ID");
+	} else {
+		if (!optional && report_fail) {
+			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: NO BARO SENSOR #%u", instance);
+		}
+	}
 
-	// if (ret) {
-	// 	mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: BARO #%u UNCALIBRATED", instance);
-	// 	success = false;
-	// 	goto out;
-	// }
+	if (instance == 0) {
+		set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ABSPRESSURE, exists, !optional, baro_valid, status);
+	}
 
-//out:
-	set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ABSPRESSURE, true, !optional, success, status);
-	DevMgr::releaseHandle(h);
-	return success;
+	return baro_valid;
 }
 
-static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, bool optional, bool report_fail, bool prearm)
+static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status, bool optional, bool report_fail,
+			  bool prearm)
 {
 	bool present = true;
 	bool success = true;
@@ -401,20 +387,22 @@ static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &statu
 	differential_pressure_s differential_pressure = {};
 
 	if ((orb_copy(ORB_ID(differential_pressure), fd_diffpres, &differential_pressure) != PX4_OK) ||
-	    (hrt_elapsed_time(&differential_pressure.timestamp) > 1000000)) {
+	    (hrt_elapsed_time(&differential_pressure.timestamp) > 1_s)) {
 		if (report_fail && !optional) {
 			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR MISSING");
 		}
+
 		present = false;
 		success = false;
 		goto out;
 	}
 
 	if ((orb_copy(ORB_ID(airspeed), fd_airspeed, &airspeed) != PX4_OK) ||
-	    (hrt_elapsed_time(&airspeed.timestamp) > 1000000)) {
+	    (hrt_elapsed_time(&airspeed.timestamp) > 1_s)) {
 		if (report_fail && !optional) {
 			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR MISSING");
 		}
+
 		present = false;
 		success = false;
 		goto out;
@@ -430,6 +418,7 @@ static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &statu
 		if (report_fail) {
 			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: AIRSPEED SENSOR STUCK");
 		}
+
 		present = true;
 		success = false;
 		goto out;
@@ -444,6 +433,7 @@ static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &statu
 		if (report_fail) {
 			mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: CHECK AIRSPEED CAL OR PITOT");
 		}
+
 		present = true;
 		success = false;
 		goto out;
@@ -451,8 +441,10 @@ static bool airspeedCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &statu
 
 out:
 	set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_DIFFPRESSURE, present, !optional, success, status);
+
 	orb_unsubscribe(fd_airspeed);
 	orb_unsubscribe(fd_diffpres);
+
 	return success;
 }
 
@@ -471,7 +463,7 @@ static bool powerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 		if (orb_copy(ORB_ID(system_power), system_power_sub, &system_power) == PX4_OK) {
 
-			if (hrt_elapsed_time(&system_power.timestamp) < 200000) {
+			if (hrt_elapsed_time(&system_power.timestamp) < 200_ms) {
 
 				/* copy avionics voltage */
 				float avionics_power_rail_voltage = system_power.voltage5v_v;
@@ -504,7 +496,8 @@ static bool powerCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 	return success;
 }
 
-static bool ekf2Check(orb_advert_t *mavlink_log_pub, vehicle_status_s &vehicle_status, bool optional, bool report_fail, bool enforce_gps_required)
+static bool ekf2Check(orb_advert_t *mavlink_log_pub, vehicle_status_s &vehicle_status, bool optional, bool report_fail,
+		      bool enforce_gps_required)
 {
 	bool success = true; // start with a pass and change to a fail if any test fails
 	bool present = true;
@@ -615,11 +608,18 @@ static bool ekf2Check(orb_advert_t *mavlink_log_pub, vehicle_status_s &vehicle_s
 			// The EKF is not using GPS
 			if (ekf_gps_check_fail) {
 				// Poor GPS quality is the likely cause
-				if (report_fail) mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS QUALITY POOR");
+				if (report_fail) {
+					mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS QUALITY POOR");
+				}
+
 				gps_success = false;
+
 			} else {
 				// Likely cause unknown
-				if (report_fail) mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF NOT USING GPS");
+				if (report_fail) {
+					mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: EKF NOT USING GPS");
+				}
+
 				gps_success = false;
 				gps_present = false;
 			}
@@ -636,7 +636,10 @@ static bool ekf2Check(orb_advert_t *mavlink_log_pub, vehicle_status_s &vehicle_s
 						  + (1 << estimator_status_s::GPS_CHECK_FAIL_MAX_SPD_ERR))) > 0);
 
 			if (gps_quality_fail) {
-				if (report_fail) mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS QUALITY POOR");
+				if (report_fail) {
+					mavlink_log_critical(mavlink_log_pub, "PREFLIGHT FAIL: GPS QUALITY POOR");
+				}
+
 				gps_success = false;
 				success = false;
 				goto out;
@@ -647,7 +650,9 @@ static bool ekf2Check(orb_advert_t *mavlink_log_pub, vehicle_status_s &vehicle_s
 out:
 	set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_AHRS, present, !optional, success && present, vehicle_status);
 	set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GPS, gps_present, enforce_gps_required, gps_success, vehicle_status);
+
 	orb_unsubscribe(sub);
+
 	return success;
 }
 
@@ -655,7 +660,7 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 		    vehicle_status_flags_s &status_flags, bool checkGNSS, bool reportFailures, bool prearm,
 		    const hrt_abstime &time_since_boot)
 {
-	if (time_since_boot < 2000000) {
+	if (time_since_boot < 2_s) {
 		// the airspeed driver filter doesn't deliver the actual value yet
 		reportFailures = false;
 	}
@@ -677,32 +682,15 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 	reportFailures = (reportFailures && status_flags.condition_system_hotplug_timeout && !status_flags.condition_calibration_enabled);
 
-#ifdef __PX4_QURT
-	// WARNING: Preflight checks are important and should be added back when
-	// all the sensors are supported
-	PX4_WARN("Preflight checks always pass on Snapdragon.");
-	checkSensors = false;
-#elif defined(__PX4_POSIX_RPI)
-	PX4_WARN("Preflight checks for mag, acc, gyro always pass on RPI");
-	checkSensors = false;
-#elif defined(__PX4_POSIX_BBBLUE)
-	PX4_WARN("Preflight checks for mag, acc, gyro always pass on BBBLUE");
-	checkSensors = false;
-#elif defined(__PX4_POSIX_BEBOP)
-	PX4_WARN("Preflight checks always pass on Bebop.");
-	checkSensors = false;
-#elif defined(__PX4_POSIX_OCPOC)
-	PX4_WARN("Preflight checks always pass on OcPoC.");
-	checkSensors = false;
-#endif
-
 	bool failed = false;
 
 	/* ---- MAG ---- */
 	if (checkSensors) {
 		bool prime_found = false;
-		int32_t prime_id = 0;
+
+		int32_t prime_id = -1;
 		param_get(param_find("CAL_MAG_PRIME"), &prime_id);
+
 		int32_t sys_has_mag = 1;
 		param_get(param_find("SYS_HAS_MAG"), &sys_has_mag);
 
@@ -710,24 +698,31 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 		/* check all sensors individually, but fail only for mandatory ones */
 		for (unsigned i = 0; i < max_optional_mag_count; i++) {
-			bool required = (i < max_mandatory_mag_count) && sys_has_mag == 1;
-			int device_id = -1;
+			const bool required = (i < max_mandatory_mag_count) && (sys_has_mag == 1);
+			const bool report_fail = (reportFailures && !failed && !mag_fail_reported);
 
-			if (!magnometerCheck(mavlink_log_pub, status, i, !required, device_id, (reportFailures && !failed && !mag_fail_reported)) && required) {
-				failed = true;
-				mag_fail_reported = true;
-			}
+			int32_t device_id = -1;
 
-			if (device_id == prime_id) {
-				prime_found = true;
+			if (magnometerCheck(mavlink_log_pub, status, i, !required, device_id, report_fail)) {
+
+				if ((prime_id > 0) && (device_id == prime_id)) {
+					prime_found = true;
+				}
+
+			} else {
+				if (required) {
+					failed = true;
+					mag_fail_reported = true;
+				}
 			}
 		}
 
 		/* check if the primary device is present */
-		if (!prime_found && prime_id != 0) {
-			if ((reportFailures && !failed)) {
+		if (!prime_found) {
+			if (reportFailures && !failed) {
 				mavlink_log_critical(mavlink_log_pub, "Primary compass not found");
 			}
+
 			set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_MAG, false, true, false, status);
 			failed = true;
 		}
@@ -741,31 +736,38 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 	/* ---- ACCEL ---- */
 	if (checkSensors) {
 		bool prime_found = false;
-		int32_t prime_id = 0;
+		int32_t prime_id = -1;
 		param_get(param_find("CAL_ACC_PRIME"), &prime_id);
 
 		bool accel_fail_reported = false;
 
 		/* check all sensors individually, but fail only for mandatory ones */
 		for (unsigned i = 0; i < max_optional_accel_count; i++) {
-			bool required = (i < max_mandatory_accel_count);
-			int device_id = -1;
+			const bool required = (i < max_mandatory_accel_count);
+			const bool report_fail = (reportFailures && !failed && !accel_fail_reported);
 
-			if (!accelerometerCheck(mavlink_log_pub, status, i, !required, checkDynamic, device_id, (reportFailures && !failed && !accel_fail_reported)) && required) {
-				failed = true;
-				accel_fail_reported = true;
-			}
+			int32_t device_id = -1;
 
-			if (device_id == prime_id) {
-				prime_found = true;
+			if (accelerometerCheck(mavlink_log_pub, status, i, !required, checkDynamic, device_id, report_fail)) {
+
+				if ((prime_id > 0) && (device_id == prime_id)) {
+					prime_found = true;
+				}
+
+			} else {
+				if (required) {
+					failed = true;
+					accel_fail_reported = true;
+				}
 			}
 		}
 
 		/* check if the primary device is present */
-		if (!prime_found && prime_id != 0) {
-			if ((reportFailures && !failed)) {
+		if (!prime_found) {
+			if (reportFailures && !failed) {
 				mavlink_log_critical(mavlink_log_pub, "Primary accelerometer not found");
 			}
+
 			set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ACC, false, true, false, status);
 			failed = true;
 		}
@@ -774,31 +776,38 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 	/* ---- GYRO ---- */
 	if (checkSensors) {
 		bool prime_found = false;
-		int32_t prime_id = 0;
+		int32_t prime_id = -1;
 		param_get(param_find("CAL_GYRO_PRIME"), &prime_id);
 
 		bool gyro_fail_reported = false;
 
 		/* check all sensors individually, but fail only for mandatory ones */
 		for (unsigned i = 0; i < max_optional_gyro_count; i++) {
-			bool required = (i < max_mandatory_gyro_count);
-			int device_id = -1;
+			const bool required = (i < max_mandatory_gyro_count);
+			const bool report_fail = (reportFailures && !failed && !gyro_fail_reported);
 
-			if (!gyroCheck(mavlink_log_pub, status, i, !required, device_id, (reportFailures && !failed && !gyro_fail_reported)) && required) {
-				failed = true;
-				gyro_fail_reported = true;
-			}
+			int32_t device_id = -1;
+
+			if (gyroCheck(mavlink_log_pub, status, i, !required, device_id, report_fail)) {
+
+				if ((prime_id > 0) && (device_id == prime_id)) {
+					prime_found = true;
+				}
 
-			if (device_id == prime_id) {
-				prime_found = true;
+			} else {
+				if (required) {
+					failed = true;
+					gyro_fail_reported = true;
+				}
 			}
 		}
 
 		/* check if the primary device is present */
-		if (!prime_found && prime_id != 0) {
-			if ((reportFailures && !failed)) {
+		if (!prime_found) {
+			if (reportFailures && !failed) {
 				mavlink_log_critical(mavlink_log_pub, "Primary gyro not found");
 			}
+
 			set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_GYRO, false, true, false, status);
 			failed = true;
 		}
@@ -807,8 +816,10 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 	/* ---- BARO ---- */
 	if (checkSensors) {
 		bool prime_found = false;
-		int32_t prime_id = 0;
+
+		int32_t prime_id = -1;
 		param_get(param_find("CAL_BARO_PRIME"), &prime_id);
+
 		int32_t sys_has_baro = 1;
 		param_get(param_find("SYS_HAS_BARO"), &sys_has_baro);
 
@@ -816,25 +827,31 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 		/* check all sensors, but fail only for mandatory ones */
 		for (unsigned i = 0; i < max_optional_baro_count; i++) {
-			bool required = (i < max_mandatory_baro_count) && sys_has_baro == 1;
-			int device_id = -1;
+			const bool required = (i < max_mandatory_baro_count) && (sys_has_baro == 1);
+			const bool report_fail = (reportFailures && !failed && !baro_fail_reported);
 
-			if (!baroCheck(mavlink_log_pub, status, i, !required, device_id, (reportFailures && !failed && !baro_fail_reported)) && required) {
-				failed = true;
-				baro_fail_reported = true;
-			}
+			int32_t device_id = -1;
 
-			if (device_id == prime_id) {
-				prime_found = true;
+			if (baroCheck(mavlink_log_pub, status, i, !required, device_id, report_fail)) {
+				if ((prime_id > 0) && (device_id == prime_id)) {
+					prime_found = true;
+				}
+
+			} else {
+				if (required) {
+					failed = true;
+					baro_fail_reported = true;
+				}
 			}
 		}
 
 		// TODO there is no logic in place to calibrate the primary baro yet
 		// // check if the primary device is present
-		if (!prime_found && prime_id != 0) {
+		if (!prime_found && false) {
 			if (reportFailures && !failed) {
 				mavlink_log_critical(mavlink_log_pub, "Primary barometer not operational");
 			}
+
 			set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_ABSPRESSURE, false, true, false, status);
 			failed = true;
 		}
@@ -869,6 +886,7 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 			set_health_flags(subsystem_info_s::SUBSYSTEM_TYPE_RCRECEIVER, status_flags.rc_signal_found_once, true, false, status);
 			status_flags.rc_calibration_valid = false;
+
 		} else {
 			// The calibration is fine, but only set the overall health state to true if the signal is not currently lost
 			status_flags.rc_calibration_valid = true;
@@ -890,7 +908,8 @@ bool preflightCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
 
 	if (estimator_type == 2) {
 		// don't report ekf failures for the first 10 seconds to allow time for the filter to start
-		bool report_ekf_fail = (time_since_boot > 10 * 1000000);
+		bool report_ekf_fail = (time_since_boot > 10_s);
+
 		if (!ekf2Check(mavlink_log_pub, status, false, reportFailures && report_ekf_fail && !failed, checkGNSS)) {
 			failed = true;
 		}
diff --git a/src/modules/simulator/accelsim/accelsim.cpp b/src/modules/simulator/accelsim/accelsim.cpp
index c4fd55077a719224659dc9056ff0c3f15ad9f33e..77fda93d0d108d861a982480ba79d1dc5fd080dd 100644
--- a/src/modules/simulator/accelsim/accelsim.cpp
+++ b/src/modules/simulator/accelsim/accelsim.cpp
@@ -837,6 +837,8 @@ ACCELSIM::_measure()
 
 	accel_report.timestamp = hrt_absolute_time();
 
+	accel_report.device_id = 1310728;
+
 	// use the temperature from the last mag reading
 	accel_report.temperature = _last_temperature;
 
@@ -919,6 +921,7 @@ ACCELSIM::mag_measure()
 
 
 	mag_report.timestamp = hrt_absolute_time();
+	mag_report.device_id = 196616;
 	mag_report.is_external = false;
 
 	mag_report.x_raw = (int16_t)(raw_mag_report.x / _mag_range_scale);
diff --git a/src/modules/simulator/gyrosim/gyrosim.cpp b/src/modules/simulator/gyrosim/gyrosim.cpp
index 1d1e79378d96e9d9fe99f89159f7ef2b24e9ae06..5c274f5e225df4bac78708a4ac6e3dc25220839f 100644
--- a/src/modules/simulator/gyrosim/gyrosim.cpp
+++ b/src/modules/simulator/gyrosim/gyrosim.cpp
@@ -968,7 +968,7 @@ GYROSIM::_measure()
 	arb.z_integral = aval_integrated(2);
 
 	/* fake device ID */
-	arb.device_id = 6789478;
+	arb.device_id = 1376264;
 
 	grb.x_raw = (int16_t)(mpu_report.gyro_x / _gyro_range_scale);
 	grb.y_raw = (int16_t)(mpu_report.gyro_y / _gyro_range_scale);
@@ -991,12 +991,11 @@ GYROSIM::_measure()
 	grb.z_integral = gval_integrated(2);
 
 	/* fake device ID */
-	grb.device_id = 3467548;
+	grb.device_id = 2293768;
 
 	_accel_reports->force(&arb);
 	_gyro_reports->force(&grb);
 
-
 	if (accel_notify) {
 		if (!(_pub_blocked)) {
 			/* publish it */
diff --git a/src/modules/uORB/Subscription.hpp b/src/modules/uORB/Subscription.hpp
index 6807dd1e3f2a93c794cefb21eebb3e6eb1182145..c0137df5743241f751aaea53efd0e590cb2aeb0c 100644
--- a/src/modules/uORB/Subscription.hpp
+++ b/src/modules/uORB/Subscription.hpp
@@ -90,8 +90,10 @@ public:
 
 protected:
 	const struct orb_metadata *_meta;
+
 	unsigned _instance;
-	int _handle;
+
+	int _handle{-1};
 };
 
 /**
@@ -155,7 +157,9 @@ public:
 		     List<SubscriptionNode *> *list = nullptr):
 		SubscriptionNode(meta, interval, instance, list),
 		_data() // initialize data structure to zero
-	{}
+	{
+		forcedUpdate();
+	}
 
 	~Subscription() override = default;