Excellent for volunteer SAR work.

I have been using this free app for quite some time in the field during search operations. It is simple and to the point when all you need is a set of coordinated to relay to command or arrange pick by helicopter. Sharing your location via text when radio comms fails is a significant plus for searcher safety. I did prefer the previous version that had both coordinate systems on one screen, but hey, how hard is it really to swipe a screen. On a side note. I still carry a dedicated gps unit as the antenna is far superior to an iPhone and a buttery change is possible after several hours or days in the bush.

Zrig about Tomstrails GPS Duo, v2.1