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Angles

Decimal and degrees/minutes/seconds notation

Maps and GPS receivers show latitude and longitude angles, Maps show bold lines marked in degrees in whole numbers plus possibly intermediate lines marked 15, 30, 45 minutes or 10, 20, 30, 40, 50 minutes.

GPS receivers show degrees plus minutes and decimal fractions of a minute,  (45 : 23.1234) You can normally alter the display options on GPS receivers, I know you can on the tomtom go.

Each degree can be subdivided into 60 minutes, and each minute into 60 seconds.

In cases where the map/gps readout is in degrees and minutes, you need to convert the minutes part to decimal parts of a degree, by dividing the number of minutes by 60.

50 deg 30 minutes north = 50.5 degrees
45 deg 11 minutes east = 45.1833 degrees