I've inherited some 20 year old waypoint data that was taken with a Garmin GPS. I don't recognize the lat/lon coordinates as DMS, decimal minutes, or decimal degrees. Here's one record as an example: Lat 4531.38153 Long 12347.2328. I know the very general location of this record to be Lat 45 degrees, Lon -123 degrees.
Can somebody tell me the format of these coordinates so I can convert to decimal degrees?