UTM Grid Ref Compass is a travel and navigation app developed by Michael Irving. It is designed to provide the user's current location on the Universal Transverse Mercator (UTM) geographic coordinate system, along with other useful information. This app is ideal for outdoor activities such as walking and climbing, but it is important to remember to always carry a map and physical compass in addition to your iPhone.

The app provides the user with their current UTM Grid Ref, a compass bearing, WGS84 latitude and longitude values, and an indication of the current hemisphere. It also includes a graphical guide to the United States UTM zones. For the best accuracy, it is recommended to use the app in an open space, away from trees or hill edges, and with the phone in a flat position. The app requires Location Services to be enabled on the iPhone, and the user must grant permission for the app to use them.

In addition, the user can send or share their location information through text message (or iMessage), email, or Twitter, provided they have an internet connection and have correctly configured their settings. It should be noted that this app is only compatible with iPhone and is not compatible with iPod Touch or non-cellular iPads due to the lack of GPS and compass hardware.