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will be ridden in rain a fair bit
I've had 2 800s, 2 810s and 1 1000 (amongst others) and they've all suffered from water penetration when riding in the rain for long periods. In my experience no Garmin USB port is genuinely waterproof, and they will all die if ridden in the rain for long enough. On Transalp 2017, which was prodigiously squelchy, I managed to see off 2 810s and a 1000.
I lost my etrex 20 on a ride last weekend. sad times. time for something different.
which of these is best for long MTB rides, from one day to one week? charge from dynamo hub or power bank. will be ridden in rain a fair bit, and don't want anything that relies on a phone.
will always be following a GPX track only. never do "routes".