My phone is OK but if I'm somewhere with bad/no data signal, it can be frustrating. It also drains the hell out of the battery (data+bluetooth). I don't need anything fancy, just something to throw in a tank bag for turn-by-turn directions for when I'm in the general area. Is there anything worth buying used for $50 or less? I would probably need it only once a quarter, if that, so I don't know if it would be worth it to buy one or just stick with my phone.