Do Garmin not still do the trainer software - a simulation which runs on a PC and lets you explore the GPS?
I have the Garmin 430 trainer on my PC, and someone offered me a copy of the Garmin 1000 trainer a while ago (which I declined because I had no use for it). I thought these were freely downloadable from the Garmin website, but a search of the website didn't turn up anything relevant at all (free or otherwise).
FFF
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