Whichever you get make sure it has a "high sensitivity" receiver which I would think all new stuff does. Older (and cheaper) ones may not. The difference between my current (new chipset) and previous (old chipset) Garmins was huge. The new one will get a signal fix and keep it where you'd be wandering around pointing the old one to the sky and hoping, built up areas with high rise was really annoying, the old one losing signal just before the most complex junctions so you would always get lost!
On a bike you really want turn by turn voice directions if you are going to try to follow what it wants in a town that you have a map for.
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