How I can over come the battery longevity issue? I will be attempting my first 200k brevet to see if I like brevets and don't want to get lost and receive a dnf on my first brevet. I have an harman/kardan car gps that cost about $100 several years ago at Cosco but don't know how I would ad aux power to it. My wifey says if I get into it and like it that I could get the Garmin 705 with all the bells and whistles.
