On a recent trip (not as big as the one you're planning) I used a Garmin Oregon with a touratech handlebar mount designed for a motorbike. It will run from a USB stem powered by a front dynamo but with the added benefit of using widely available AA batteries as well as a back up. I picked the complete set up for £50 from Ebay as it is an older model. You can plan routes offline using basecamp and maps can be put on SD cards. It also recalculates when a turn is missed as long as you are using routing and not following a track. It has a cycling mode as well for calculating cycle specific routes. Doubles as a handheld unit as well for when you are off the bike.
|