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Huh, then maybe 46/30 might be better, the jump is exactly the same as a 50/34 anyway.
The GPS is a Wahoo Elment Bolt! very capable, plus I charge it with a battery pack at the refuges (you should've seen all the other walkers overloading the only power plug in the refuges for their phones and gps!).
Simple case of fitting a 44/28 chainset.