I don't see right off how to work POI's in FreeScan, but on the scanner if you want to change from East to West you put the cursor over the "E" or "W" at the far right of the coordinates and press 4 or 6 ( < > ) to change it.
If you have an "E" or "W" indication in coordinates you do not need a "-" sign at the beginning. A negative sign or lack thereof takes the place of the E or W.
All of the following are valid and acceptable ways to write geographic coordinates:
40:26:46.302N 079:58:55.903W
40°26′46″N 079°58′56″W
40d 26′ 46″ N 079d 58′ 56″ W
40.446195N 79.982195W
40.446195, -79.982195
40.446195,-79.982195
40° 26.7717, -79° 58.93172
N40:26:46.302 W079:58:55.903
N40°26′46″ W079°58′56″
N40d 26′ 46″ W079d 58′ 56″
N40.446195 W79.982195