My only issue so far with the Nuvis for overland use are
1.) Most (if not all) don't have removable batteries. Might not sound like a big deal if its always plugged into the truck, but I've had mine lockup on me while 5-10 miles off the beaten path. There's no hard reset on it and you can't pull the batteries. Needed to wait until it fully discharged them overnight before it would reboot.
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Havent had to reboot my Nuvi before, but your correct on my 60csx and Oregon 550. Depending on where it is frozen, you can reboot most NUVI by plugging it into a non garmin USB charger. It will assume it has gone into computer mode, shut down the GPS and once unplugged it will recover. OR NOT.
Good to know.. I'll try that trick next time as I normally have some other stuff, including a computer, with me on most trips..
I've only had mine lock up once, seemed to be caused when pulling it in and out of its cradle. the main issue was it couldn't have been at a worse time. On a longer trail I'd never been on, just glad the compass and topo map still worked