I want to set up this question by describing my situation.
My wife and I are about to do a 12 hour endurance race. I have the fenix 5xplus and she has the forerunner 245.
We want to track the run and listen to music the whole time. My watch battery should have no issue doing this but i suspect running both the GPS and music will drain her battery.
Is there anyway for her to piggyback off my GPS data?
We will be running together the whole time.