So my brother bought a GPS receiver for comptuers. It's the Delorme
Earthmate LT20. It came with Street Atlas 2006 software. He bought it for
other uses, but we're thinking it might be fun & interesting to use it on
the boat too. I have an old laptop with the necessary USB port & cabability.

Question is: What nautical software charts are there and what are the
differences.

Mostly this is just for fun & interest for us. Our boat is only a 22 feet
and we already have a handheld GPS that does not have mapping. We don't go
anywhere that we *have* to have mapping, but still would like to play around
with this.

So are there any options for software charts that aren't toooo expensive but
would work, show depths, etc.

Oh, we boat on the Hudson (not too much need for GPS as you either go north
or south), will be on Lake George this summer (again not too much need for
GPS) and are also planning a little trip from Boston to probably Glouster
(GPS on the comptuer not necessary but that would be the most useful place
to have a map of for us).

Thanks,
Gary