Offline Coordinate Converter

Originally from ticket #16732.

I use BCN with our local SAR. We'll get a ping on a phone and we'll need to convert the coordinates quickly, often in the woods at night. While we use UTM, cell phone will usually ping with decimal degrees, and sometimes minutes and seconds. Furthermore in coordinating with aircraft, we'll have to resort to lat/long. I've been trying to use the waypoint feature, but somehow, it doesn't always take. I've only had limited success switching to one type of coordinate and back to the other. It doesn't seem to want to add the waypoints.

So, an offline converter would be a great feature, listing all other formats and automatically creating a waypoint. It should then have a big go to button (remember, we're in the dark fumbling around). And instead of a line a nice big arrow with distance would be great.