How to Show UTM, Lat/Long, and OSGB Coordinates on iPhone

TL;DR

MGRS GPS shows your position in many formats — MGRS/USNG, UTM/UPS, latitude/longitude (decimal, DDM, DMS), and OSGB British National Grid — with up to three displayed at once for easy cross-referencing.

Steps

In MGRS GPS, open the coordinate display options.
Choose the formats you want: MGRS/USNG, UTM/UPS, lat/long, or OSGB.
For lat/long, pick decimal, DDM, or DMS.
Show up to three formats at once.
Tap any readout to copy that format.

Why it works this way

Different teams and maps speak different coordinate languages — a hiker’s lat/long, a surveyor’s OSGB, a soldier’s MGRS. Showing several formats at once lets you read your position in the one you need and hand it to someone who needs another, without converting by hand. GeographicLib-validated math keeps every format consistent.

Tips & edge cases

Pair MGRS with lat/long when coordinating with civilian apps.
OSGB is there for British National Grid maps.
Up to three at once — pick the combination your task needs.

FAQ

Which formats are supported? MGRS/USNG, UTM/UPS, latitude/longitude (decimal, DDM, DMS), and OSGB British National Grid.

Can I see more than one at a time? Yes. Show up to three formats at once for quick cross-referencing.

Are conversions accurate? The coordinate engine is validated against GeographicLib conventions.