Good reminder, my topo maps are in NAD83 UTM. I need figure out how to get my OruxMaps App to display 8 digits. It has been a long time since I used the grid on the map - I blame the oversue of GPS/Mapping for the lost art of navigation.I am more of an 8-digit-grid kind of guy, the problem is it's so difficult to get topo maps these days and GPS is often useless on the trail.
I wonder what receiving coordinates from people in an emergency situation is like. Folks reading out all these digits in different formats, and if, they can figure out how to get the App to display the numbers under stress. I suspect having someone read an 8-digit NAD83 UTM is a rarity these days.I'm involved with Search and Rescue and we use UTM exclusively. Doesn't work for water or air travel but it's highly accurate for land travel. I teach a land navigation class to our SAR teams every year and this is the cornerstone of that class.