W2XQ pretty well nailed it. When LatLongs are being used, they're usually given over comms in the natural groups: Degrees > Minutes > Decimal Minutes, or sometimes but not often, Seconds. Grid locations instead of LatLongs are also used, but they are a completely different format. There are phone apps that will convert it for you. Navigation apps and nav gear allow you to choose the format that suits the operation and will convert from any one to the others.