I could certainly use a better system for remembering where I park my bike. One system: Take a photo of the bike every time you park it in a non-standard place

I could certainly use a better system for remembering where I park my bike. One system: Take a photo of the bike every time you park it in a non-standard place (standard being e.g. "work", "home" or "girlfriend's"). Unfortunately, taking out my smart-phone every time I go grocery-shopping is bothersome, and I might only find out I need to suddenly go elsewhere when I've already parked the bike. Ideally, my bike (or, through statistical inference, my smartphone) should just publish GPS coordinates. Unfortunately this drains the battery very fast. Perhaps a background service that uses the GPS a little more sparingly than the Google Maps app?