Hi, here’s my situation and I was wondering your input? I just bought the eTrex Vista HCx from Costco.com. I've enjoyed it so far. However, I noticed that if I want to upload another map a day later, it’ll overwrite that gmapsupp file. If I try renaming gmapsupp, like this website suggested, the Vista HCx won’t recognize the file. If I start from scratch by resending all the maps to my unit all over again, it takes more than 12 hours just to do the whole thing again (I have an 8 GB card in the unit). That's a pain.
Since Costco has a return policy if you’re not satisfied, I was thinking of returning this unit and paying the extra $100-140 to get either a Garmin Dakota 20 or Oregon 450. My questions: Do those two other units allow you to recognize the renamed gmapsupp file? Another thing I’m concerned about is if their touchscreens make it more difficult to pinpoint the exact point on the map you want compared to the eTrex's roller joystick (if you don’t have good fingernails)? How do the Dakota 20 and Oregon 450 compare to the eTrex Vista HCx?