diff --git a/libraries/AP_NavEKF3/AP_NavEKF3.cpp b/libraries/AP_NavEKF3/AP_NavEKF3.cpp
index 7f861fa46d..db8f616817 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3.cpp
@@ -637,8 +637,7 @@ void NavEKF3::check_log_write(void)
         logging.log_baro = false;
     }
     if (logging.log_imu) {
-        const AP_InertialSensor &ins = _ahrs->get_ins();
-        DataFlash_Class::instance()->Log_Write_IMUDT(ins, imuSampleTime_us, _logging_mask.get());
+        DataFlash_Class::instance()->Log_Write_IMUDT(imuSampleTime_us, _logging_mask.get());
         logging.log_imu = false;
     }
 
@@ -653,7 +652,7 @@ bool NavEKF3::InitialiseFilter(void)
     if (_enable == 0) {
         return false;
     }
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
 
     imuSampleTime_us = AP_HAL::micros64();
 
@@ -756,7 +755,7 @@ void NavEKF3::UpdateFilter(void)
 
     imuSampleTime_us = AP_HAL::micros64();
 
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
 
     bool statePredictEnabled[num_cores];
     for (uint8_t i=0; i<num_cores; i++) {
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_Measurements.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_Measurements.cpp
index 6b301f956a..84d682e8ca 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_Measurements.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_Measurements.cpp
@@ -329,7 +329,7 @@ void NavEKF3_core::readMagData()
  */
 void NavEKF3_core::readIMUData()
 {
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
 
     // calculate an averaged IMU update rate using a spike and lowpass filter combination
     dtIMUavg = 0.02f * constrain_float(ins.get_loop_delta_t(),0.5f * dtIMUavg, 2.0f * dtIMUavg) + 0.98f * dtIMUavg;
@@ -437,7 +437,7 @@ void NavEKF3_core::readIMUData()
 // read the delta velocity and corresponding time interval from the IMU
 // return false if data is not available
 bool NavEKF3_core::readDeltaVelocity(uint8_t ins_index, Vector3f &dVel, float &dVel_dt) {
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
 
     if (ins_index < ins.get_accel_count()) {
         ins.get_delta_velocity(ins_index,dVel);
@@ -583,7 +583,7 @@ void NavEKF3_core::readGpsData()
 // read the delta angle and corresponding time interval from the IMU
 // return false if data is not available
 bool NavEKF3_core::readDeltaAngle(uint8_t ins_index, Vector3f &dAng) {
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
 
     if (ins_index < ins.get_gyro_count()) {
         ins.get_delta_angle(ins_index,dAng);
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_VehicleStatus.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_VehicleStatus.cpp
index 834cb7277f..1ecb25a7a1 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_VehicleStatus.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_VehicleStatus.cpp
@@ -451,7 +451,7 @@ void NavEKF3_core::detectOptFlowTakeoff(void)
 {
     if (!onGround && !takeOffDetected && (imuSampleTime_ms - timeAtArming_ms) > 1000) {
         // we are no longer confidently on the ground so check the range finder and gyro for signs of takeoff
-        const AP_InertialSensor &ins = _ahrs->get_ins();
+        const AP_InertialSensor &ins = AP::ins();
         Vector3f angRateVec;
         Vector3f gyroBias;
         getGyroBias(gyroBias);
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
index aef7ffff83..c70a2a23b3 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
@@ -53,8 +53,8 @@ bool NavEKF3_core::setup_core(NavEKF3 *_frontend, uint8_t _imu_index, uint8_t _c
      */
 
     // Calculate the expected EKF time step
-    if (_ahrs->get_ins().get_sample_rate() > 0) {
-        dtEkfAvg = 1.0f / _ahrs->get_ins().get_sample_rate();
+    if (AP::ins().get_sample_rate() > 0) {
+        dtEkfAvg = 1.0f / AP::ins().get_sample_rate();
         dtEkfAvg = MAX(dtEkfAvg,EKF_TARGET_DT);
     } else {
         return false;
@@ -155,7 +155,7 @@ bool NavEKF3_core::setup_core(NavEKF3 *_frontend, uint8_t _imu_index, uint8_t _c
 void NavEKF3_core::InitialiseVariables()
 {
     // calculate the nominal filter update rate
-    const AP_InertialSensor &ins = _ahrs->get_ins();
+    const AP_InertialSensor &ins = AP::ins();
     localFilterTimeStep_ms = (uint8_t)(1000*ins.get_loop_delta_t());
     localFilterTimeStep_ms = MAX(localFilterTimeStep_ms, (uint8_t)EKF_TARGET_DT_MS);
 
@@ -430,7 +430,7 @@ bool NavEKF3_core::InitialiseFilterBootstrap(void)
     Vector3f initAccVec;
 
     // TODO we should average accel readings over several cycles
-    initAccVec = _ahrs->get_ins().get_accel(imu_index);
+    initAccVec = AP::ins().get_accel(imu_index);
 
     // normalise the acceleration vector
     float pitch=0, roll=0;