In a previous article, said:
Aviation GPS's need periodic map updates. So what I'd ideally like is
rather low-end land/marine unit with a basic map (cities, highways,
shoreline, other topographic features) that has available software to
create my own waypoint database of airports and navaids to supplement
the base map.

Anyone using something like that?

Take a look at EasyGPS.com - it will tell you what GPSes will accept a
load of data from a GPX format file. Then you can generate GPX format
files from my web site, http://navaid.com/GPX/ - I update the data on that
site every 28 days from DAFIF data and every 56 days from FAA data.

--
Paul Tomblin http://xcski.com/blogs/pt/
"If something's expensive to develop, and somebody's not going to get paid, it
won't get developed. So you decide: Do you want software to be written, or
not?" - Bill Gates doesn't foresee the FSF or Linux, 1980.