diff --git a/master/master/lib/gps.c b/master/master/lib/gps.c
--- a/master/master/lib/gps.c
+++ b/master/master/lib/gps.c
@@ -454,7 +454,15 @@ void parse_gps_transmission(void){
 			}
 			else if(byte == ',') //end of this data type
 			{
-				altitude[numBytes] = 0x00;
+				// If we actually have an altitude
+				if(numBytes>0) 
+				{
+					altitude[numBytes-1] = 0x00; // Cut off the "M" from the end of the altitude
+				}
+				else 
+				{
+					altitude[numBytes] = 0x00;
+				}					
 				setParserState(GGA_WGS84);
 				numBytes = 0; //prep for next phase of parse
 			}