I'm considering the purchase of a new GPS. The Garmin Edge 25 has most of the basic features I need. However, high accuracy is important to me as I do trail mapping for my local MTB club. I thought that getting a unit with GLONASS support would help improve accuracy, but I was concerned about runtime since the manual indicates it will reduce battery life.
What is the impact on battery life of enabling GLONASS support on the Garmin Edge 25?