Gridref

Convert degrees, DMS, UTM and MGRS coordinates, with distance and bearing

Gridref is a coordinate converter for map reading, field work and trip planning. Type or paste a position in any common format and it appears in every other format at once, ready to share.

How it works There is one input box. Gridref recognizes what you typed: decimal degrees, degrees with decimal minutes, degrees-minutes-seconds, UTM or MGRS. Letters N, S, E and W or plus and minus signs both work, the degree, minute and second symbols are optional, and a comma or the letters separate latitude from longitude. MGRS can be typed with or without spaces. If something does not add up, such as 61 minutes, a latitude beyond 90 degrees or a UTM easting that does not fit its latitude band, it tells you why instead of guessing.

Features - Decimal degrees, degrees and decimal minutes, and degrees-minutes-seconds - UTM with zone and latitude band, plus grid convergence and scale factor - MGRS at 10 km, 1 km, 100 m, 10 m or 1 m precision - Zone exceptions for southwest Norway (32V) and Svalbard (31X to 37X) - Clear notice for polar positions beyond 84 degrees north or 80 degrees south, which use a different grid - Zone picture: the UTM zone strip with the current latitude band and the 3 by 3 block of 100 km squares around your point, labeled with their MGRS letters - Distance and initial and final bearing between two positions in any format, worked out on the WGS84 ellipsoid with the Vincenty formula, with a labeled spherical result for the rare nearly opposite points - Distances in kilometers, miles or nautical miles - Up to 100 saved points with names and notes, sorted by distance from any of them - Share any single line or all formats together as plain text - A plain-English guide to every format

Accuracy Positions use the WGS84 datum. UTM uses a sixth-order series for the transverse Mercator projection, and MGRS letters follow the published grid lettering scheme. Results are general guidance for map work and do not replace official charts or local rules. If your paper map uses an older datum, the same numbers can point to a spot some distance away, so check the datum printed on the map.

Your data Gridref never asks for your location and has no internet permission. You type every coordinate yourself, and your saved points stay in the app's own storage on the phone until you delete them or reset the app. There are no accounts and no ads.

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