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Josh
@frank9755
Before you spend money on another gadget, have you ruled out using a phone app, such as osmand or bikecomputer?
The advantage is they'll give you much better maps.
A phone takes more battery power than a GPS, but you probably want to keep it charged anyway for other stuff. So how many hours you plan to ride per day, how many days you will be off grid and what your charging plan is dictates how many power banks you would need and if its viable.
Eg a long weekend riding 6 hours a day with no dynamo, probably fine with 1 x 10 ah power bank.