sendmap20 - if you don't have Mapsource, but still want to create your own
map - or even you just want to get one of the free map for Garmin GPS (
i.e. from
php.astronet.pl/mapcenter ) AND your GPS has USB connection - you
may find this software very useful.
Now sendmap20 is working not only with COM interface but also with USB
interface - be aware - this software base on reverse engineering of Garmin
protocol!
Sendmap20 can be downloaded from http://gps.chrisb.org