You should look at buying an old Street pilot. Garmin 2610 etc which still have great features for an 8 year old unit.
However, I've just replaced my very old and battered one for a Garmin Etrex Vista HCX which was £89 NEW on Amazon.
You can put OSM maps straight on for free and it does routing. You can also use it for hiking, sailing etc. I can get FULL signal inside my house too which I would never get on the 2610.
It takes AA batteries and uses a SD Micro card slot. It's not touch screen like the more expensive models (or the street pilots) but it's more than good enough if you just want something to follow and get you out of a pickle.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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