diff --git a/source/drivers/MAG3110.cpp b/source/drivers/MAG3110.cpp
index 8bc18fd..5a107a3 100644
--- a/source/drivers/MAG3110.cpp
+++ b/source/drivers/MAG3110.cpp
@@ -99,7 +99,7 @@ int MAG3110::configure()
 
 
     // Bring the device online, with the requested sample frequency.
-    result = i2c.writeRegister(address, MAG_CTRL_REG1, magnetometerPeriod.get(samplePeriod) | 0x01);
+    result = i2c.writeRegister(address, MAG_CTRL_REG1, magnetometerPeriod.get(samplePeriod * 1000) | 0x01);
     if (result != MICROBIT_OK)
         return MICROBIT_I2C_ERROR;
 
diff --git a/source/drivers/MMA8653.cpp b/source/drivers/MMA8653.cpp
index 8195fc4..b1e5bcc 100644
--- a/source/drivers/MMA8653.cpp
+++ b/source/drivers/MMA8653.cpp
@@ -130,7 +130,7 @@ int MMA8653::configure()
         return MICROBIT_I2C_ERROR;
 
     // Bring the device back online, with 10bit wide samples at the requested frequency.
-    value = accelerometerPeriod.get(samplePeriod);
+    value = accelerometerPeriod.get(samplePeriod * 1000);
     result = i2c.writeRegister(address, MMA8653_CTRL_REG1, value | 0x01);
     if (result != 0)
         return MICROBIT_I2C_ERROR;
diff --git a/source/drivers/MicroBitCompass.cpp b/source/drivers/MicroBitCompass.cpp
index 16c08e5..8fee178 100644
--- a/source/drivers/MicroBitCompass.cpp
+++ b/source/drivers/MicroBitCompass.cpp
@@ -79,8 +79,8 @@ void MicroBitCompass::init(uint16_t id)
     this->id = id;
     this->status = 0;
 
-    // Set a default rate of 50Hz.
-    this->samplePeriod = 20;
+    // Set a default rate of 10Hz.
+    this->samplePeriod = 100;
     this->configure();
 
     // Assume that we have no calibration information.