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I like to have the route up all the time, when it's fixed route you can't mess it up or your possibly DQ. Plus the AA batteries mean I don't need to worry about charging, and given that a dynamo does not work so well off-road it is a headache removed. Also I stopped using power racing off road really, as it means less, so that removed my need for an edge.
skinny-
I typically have the route up all the time, because I take wrong turns so often it helps get on route quick. I probably won't have dyno wheel for Badlands, I'll just take battery packs. If I do more I might get a 650B dyno wheel built, but I get that it's less use off-road, especially at my climbing speed! :S
I considered ditching the PM last year because I was struggling to find sub-compact cranks but I like the data too much.
hippy
Yeah, the turn by turn I use a lot on the road would be useless off road. I'll probably still take the Edge for Badlands because it seems most of the gravel tracks are marked/obvious, it's not MTBing. etrex will be packed as a backup though.