Here’s a slight tangent to the OPs question that I’ve wondered for a while (having destroyed one Garmin Etrex Legend and in the process of destroying another).
Which GPS will survive rattling along trails longest before some kind of shake-related death?
I’ve found my Etrex Legend Hcx to be fab for route finding but doesn’t like hooning down a rocky decscent or two. At best it’ll usually switch itself off. After a few months of this it tends to not be keen on working properly at all ever again. I’m not talking about surviving being dropped, just being attached to bars for cross-country riding.
I’ve been looking at the Garmin Dakota as a replacement, and I believe Aidan used one for the Tour Divide. Comments vs something like the Memory Map one?