Instantly convert between GPS coordinate systems
Requires iPhone 5, or more recent - Free at the App Store
Coordinates Lite makes it a snap to convert between the four most common formats for recording latitude and longitude: decimal degrees, degrees and decimal minutes, degrees-minutes-seconds, and UTM coordinates.
To convert your coordinates, just tap the coordinates format you have and enter your new coordinates. Enter them, tap “done” and your coordinates are instantly converted into all four formats.