[RWebb]

older maps are harder to use with a GPS as they lack some of the annotations that more modern ones have

not sure I recall all this as it has been a loooong time... but one thing is to locate your basic (coarse) location -- then go to the SW corner of that box (lower LH) and use the Northing and Easting to dial it in

you can change the GPS unit to match UTM or whatever is on your map