Just make small script to do conversion from Garmin GPS data or maybe other GPS with (East/West & North/East) Degre and minute value format into latitude and longitude format that usually I used with google map.
Example Garmin Waypoint Data :
Waypoint NodeName User Waypoint S7 28.180 E110 56.250
It will South (S) 7 degree and 28.180 minute , East (E) 110 degree and 56.250 minute
Check this address :