I have the old yellow Garmin Etrex. I also have NG TOPO for the states I am interested in. I have all of the information for an upcoming trip on NG Michign. The problem is that the old GPS will only take one route and I have eight plotted on the map so I purchased an Etrex Vista H which takes 20 routes. The problem is that the new unit has a USB connector and the NG software only recognizes serial ports. On the old unit I just used a serial/USB adapter and transferred the data. NG software is 3.4.3. An upgrade to 4.0 is available for $19.95 which I "think" will then support the USB connector but I am not sure. The other option is to purchase the Garmin Map Source map for $129 with may or may not be able to import the data I already have on TOPO. I can export the NG data as a txt file but I cannot find a way to import that into the Garmin Vista H.

Anyone with more expertise with GPS and maps have any input for someone without a computer degree?

Thanks