there are a couple of freeware that allow you to record POIs and tracks
Lap Logger or GPS buddy. you can find them at:
gps Freeware Palm phone and pda programs, Free Palm OS software downloads.
If you have a Garmin BT reciever, you can use their Mobile XT software.
Once you have a gpx file, you can view it on Google Earth converting it to kml. You will need GPS bable (also free) or you can do it from GPS visualizer web page.
Or if you want to draw a Garmin compatible map, there are also ways to it for free.
I did start a map from my treo 680...
....collecting tracks and points from Mobile XT ...
... processed it with GPS Mapedit (shareware) to make a gps compatible map ...
....Then adding more info from satellite pictures (Google Earth), public maps, and calibrated maps (OzyExplorer) ....
... then compiled in mapcenter 2 ...
... and see where it got:
Mapset details