diff --git a/libraries/AP_GPS/AP_GPS.h b/libraries/AP_GPS/AP_GPS.h
index 51610dbf08..da63a9b011 100644
--- a/libraries/AP_GPS/AP_GPS.h
+++ b/libraries/AP_GPS/AP_GPS.h
@@ -28,7 +28,7 @@
    than 1 then redundant sensors may be available
  */
 #define GPS_MAX_RECEIVERS 2 // maximum number of physical GPS sensors allowed - does not include virtual GPS created by blending receiver data
-#define GPS_MAX_INSTANCES  (GPS_MAX_RECEIVERS + 1) // maximumum number of GPs instances including the 'virtual' GPS created by blending receiver data
+#define GPS_MAX_INSTANCES  (GPS_MAX_RECEIVERS + 1) // maximum number of GPs instances including the 'virtual' GPS created by blending receiver data
 #define GPS_BLENDED_INSTANCE GPS_MAX_RECEIVERS  // the virtual blended GPS is always the highest instance (2)
 #define GPS_RTK_INJECT_TO_ALL 127
 #define GPS_MAX_RATE_MS 200 // maximum value of rate_ms (i.e. slowest update rate) is 5hz or 200ms
@@ -132,14 +132,14 @@ public:
         uint16_t hdop;                      ///< horizontal dilution of precision in cm
         uint16_t vdop;                      ///< vertical dilution of precision in cm
         uint8_t num_sats;                   ///< Number of visible satellites
-        Vector3f velocity;                  ///< 3D velocitiy in m/s, in NED format
+        Vector3f velocity;                  ///< 3D velocity in m/s, in NED format
         float speed_accuracy;               ///< 3D velocity accuracy estimate in m/s
         float horizontal_accuracy;          ///< horizontal accuracy estimate in m
         float vertical_accuracy;            ///< vertical accuracy estimate in m
         bool have_vertical_velocity:1;      ///< does GPS give vertical velocity? Set to true only once available.
         bool have_speed_accuracy:1;         ///< does GPS give speed accuracy? Set to true only once available.
         bool have_horizontal_accuracy:1;    ///< does GPS give horizontal position accuracy? Set to true only once available.
-        bool have_vertical_accuracy:1;      ///< does GPS give vertical position accuract? Set to true only once available.
+        bool have_vertical_accuracy:1;      ///< does GPS give vertical position accuracy? Set to true only once available.
         uint32_t last_gps_time_ms;          ///< the system time we got the last GPS timestamp, milliseconds
     };