I'm seeking advice for navigating with my garmin 945 on a ~24h mission backcountry mission. I would like to have my watch available to use for navigation, but I worry using the "course" function will drain the battery, especially since I can't follow it exactly and want to avoid constant off-course notifications. Is there a way to display my intended course on the map without following the "course" function? I just want to look down at my watch and compare my actual location with a gpx track I will upload.