diff --git a/libraries/AP_GPS/AP_GPS.cpp b/libraries/AP_GPS/AP_GPS.cpp
index 0e4835f906..979e22315a 100644
--- a/libraries/AP_GPS/AP_GPS.cpp
+++ b/libraries/AP_GPS/AP_GPS.cpp
@@ -1107,7 +1107,7 @@ const Vector3f &AP_GPS::get_antenna_offset(uint8_t instance) const
 
 /*
   returns the desired gps update rate in milliseconds
-  this does not provide any gurantee that the GPS is updating at the requested
+  this does not provide any guarantee that the GPS is updating at the requested
   rate it is simply a helper for use in the backends for determining what rate
   they should be configuring the GPS to run at
 */
@@ -1121,7 +1121,7 @@ uint16_t AP_GPS::get_rate_ms(uint8_t instance) const
 }
 
 /*
- calculate the weightings used to blend GPs location and velocity data
+ calculate the weightings used to blend GPSs location and velocity data
 */
 bool AP_GPS::calc_blend_weights(void)
 {