Most map SW now days uses USGS topo maps as their base, so basically it is the same stuff you see in GI Joes, or Captains, but just on the computer. Garmin Mapsource deviates from this a bit, but I have Topo USA, Terrain Navigator, and Mapsoure. Topo USA and TN are basically copies of the USGS topos. The key difference is the TN stuff looks like a digitized version (literal photograph) of the USGS maps and Delorme Products are copies but not scanned.
I like all of maps, so don't ask me which ones I use the most. Mapsoure...works with my GPSs, Maptech TN is a exact copy of USGS maps, and Topo USA was my first map SW and it works well when traveling and showing my location on PC notebook.
If you have a GPS, look into what mapping SW it works with and use it. If you don't have a GPS (who doesn't

...apparently the guy lost it the fog last monday) decide which one you will buy someday and buy their SW.
Go to maptech's website and you will see an example of their mapping SW..BTW maptech is not cheap, but these are the the exact copies of USGS topos.
my 3.245365 cents. gus
[ 08-01-2003, 08:07 AM: Message edited by: Gus Orviston ]