There are several ways to express GPS coordinates. For example, you could express a waypoint (anypoint on the surface of the Earth) in Tampa, Florida as:
~N DD.DDD, W DD.DDD (e.g., N 28.132º, W 82.543º)
OR
~N DD, MM.MMM, W DD, MM.MMM (e.g., N 28º 7.933', W 82º 32.633'
OR
~N DD, MM, SS.SS, W DD, MM, SS.SS (N 28º 7' 56", W 82º 32' 38")
Possibly a few others
NOTE: N=North
W=West
D=Degrees
M=Minutes (as you know, 1/60 degree)
S=Seconds (1/3600 of a degree)
'=Minutes
"=Seconds