If you have the mobile app installed, it’s running GPS in the background anway. High accuracy mode just ups the frequency of checkin to your liking. Besides, you only need to have it on for a minute or so to determine vector. You probably already have it, but if there is any question, going high accuracy for a moment will answer it.

I don’t find that high accuracy does much to battery life as long as you’re smart with it. There are may ways to configure it so it won’t eat your battery.