I used the Google app My Tracks while walking my dog. I'm into hiking and outdoor stuff and it was cool to see distance, speed, track..etc. It can switch between metric and standard measurements. Here's my question.....if I use this on a boat, can I get data expressed in nautical miles? I couldn't see a setting to do that, but maybe there is a trick or maybe it knows to switch if on water? Any My Tracks experienced users here?