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Lezyne also makes some cycling computers with simple mapping, they start at sub-£100. "Lezyne Mini GPS Cycle Computer" is £80, a friend of mine has it and seems to work for him. I won't vouch for non Garmin/Wahoo products for nav/map but if budget is a concern you can give it a try and see if it performs up to spec. It shows just a trail to follow and your position just like the Garmin Edge 25 in the above reply. Tiny tiny fonts though.
disq
GPS still works on airplane mode on my iphone but I am not sure about samsungs.
EDIT: looks like it does work on android too