hiking gps like etrex can be bar mounted and (if citynav maps are bought and loaded) can work for car nav functions... but it's less than ideal. you get a small screen and less user-friendly interface and no audible signal (other than beeps)... and will also have to buy a mount. the cheapest nuvi is really all you need and works great, and can be had for about $130 (which is approx 1/2 the price of the maps). going the other way (nuvi for biking) you'll run into mounting and battery life issues. don't know about using a bike gps for car nav functions. imo, better to get the right tool for the job
It is really a trade of between bike and auto GPS units. Bike units are smaller in size and auto units have larger screens. I have the Garmin Edge 705 and have used it in my car, but it works best on my bike.
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