Enabling persistent location in a third-party mobile app isn't always easy -- it usually requires either cautious uses of updates, like iOS 5's geofencing, or an acceptance that there will inevitably be a knock to the battery life while it's running. Skyhook doesn't want there to be any compromise, at least on Android: an update to its developer kit has rolled in an Always-On location option that theoretically represents the best of both worlds. Third-party app writers can opt for position refreshes as quick as 30 seconds apart, if that birthday gift reminder needs just that many updates, but will supposedly face "little to no noticeable impact" on how quic