TopoXY vs UTM & MGRS Coordinates

TopoXY converts coordinates between WGS84 and the national grids of Romania, Poland, Czechia, Slovakia, Italy and Germany, for surveyors, civil engineers and GIS professionals. Pick your country once. TopoXY loads the right coordinate reference system and keeps it for every conversion, calculation and map you open. SUPPORTED COORDINATE SYSTEMS • Romania: Stereo 70, EPSG:3844 • Poland: PUWG 1992, EPSG:2180, and PUWG 2000 zones 5 to 8, EPSG:2176 to 2179 • Czechia and Slovakia: S-JTSK / Křovák, EPSG:5514 • Italy: Gauss-Boaga zones 1 and 2, EPSG:3003 and 3004, plus ETRS89 / UTM 32N and 33N • Germany: ETRS89 / UTM 32N and 33N, EPSG:25832 and 25833 CONVERSION WITHOUT SIGNAL Conversions run on your iPhone through the PROJ library, the engine behind professional desktop GIS. They need no signal and no account, which matters on a site without coverage. The map and the elevation lookups use online services, so they send the position you are viewing. WHAT YOU CAN DO • Convert between your national grid and WGS84, in both directions • Enter several points and convert them together, or import them from a text file • Measure distance and azimuth between two points • Calculate the area and perimeter of a set of points • See every point on the map: standard, hybrid or satellite • Navigate to any point with Apple Maps or another navigation app on your iPhone • Read the slope between two points, in degrees and percent, with their elevations filled in from terrain data • Look at the site in satellite view ABOUT ACCURACY The app shows the accuracy for your country with every conversion result. TopoXY uses the standard EPSG datum transformation for each grid, without a correction grid: about 1 m for Poland, Czechia, Slovakia and Germany, about 3 m for Romania and about 4 m for Italy. That is fine for field navigation and GIS work, not for cadastral or legal surveys. Check a control point you already know before you rely on any tool, this one included. BUILT FOR THE FIELD Seven languages: English, Romanian, Polish, Czech, Slovak, Italian and German. Dark mode. Location is used only when you tap a location button. TOPOXY PRO Conversions, measurements and the slope calculation are part of TopoXY Pro, which also removes ads. The map, the satellite view and navigation to a point are free. SUBSCRIPTION DETAILS TopoXY Pro is an auto-renewing subscription, weekly or monthly. New subscribers start with a 3 day free trial. After the trial it renews at the price shown in the app for your region, charged to your Apple Account at confirmation of purchase. It renews automatically for the same price and period unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel any time in Settings, tap your name, then Subscriptions. Any unused portion of a free trial is forfeited when you buy a subscription. Privacy Policy: https://topoxyapp.com/privacy.html Terms of Use: https://topoxyapp.com/terms.html EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Buy it once, keep it. No subscription, no ads, no account – and everything works in Airplane Mode. Zonepoint converts coordinates between WGS84, UTM, MGRS and Gauss-Krüger. Every calculation runs on the device. The app works entirely offline: the only thing it ever downloads is a map pack you choose – nothing else, and never on its own. THE SELF-TEST – WHY YOU CAN TRUST THE NUMBERS On demand, Zonepoint recomputes 52 published check points on your own device and reports the largest deviation for each transform family: UTM, transverse Mercator, MGRS, UPS and Gauss-Krüger. Across all 52 points the largest measured deviation stays under a tenth of a millimetre. You do not have to take our word for it – you can run it before you buy, and share the result as plain text. The check points come from NGA GEOTRANS Gold Data and AdV BeTA2007 test data. Neither organisation endorses this app. FREE, PERMANENTLY • Your position at once in WGS84 (decimal, degrees/minutes, degrees/minutes/seconds), UTM, MGRS and Gauss-Krüger • Convert: type or paste, in any of those formats • Messy input is parsed and the possible readings are ranked, with every assumption named • Copy and share as text. Any saved point, any time, permanently • A target point with distance and true bearing • Up to ten waypoints • Fix accuracy in metres, age of fix, altitude above mean sea level and ellipsoidal height • A built-in world overview map – always there, with or without a map pack • A grid plot with UTM grid lines, a scale bar and grid convergence – no basemap, no connection • The self-test, and a page listing everything in this app that touches the network • Night mode in red for dark adaptation, and sunlight mode for glare • Full German and English interfaces, each with correct number formatting PRO – one payment, no subscription • Unlimited waypoints, in folders, with notes • Import and export: GPX, KML and CSV • Multi-leg routes with distance and bearing per leg • Offline map packs for Germany, Austria and the United States: download one over Wi-Fi, then the map draws real streets in Airplane Mode with no connection at all • A UTM or MGRS grid overlay on the map, from 10 km down to 100 m • Batch conversion of a whole pasted list • Datum and ellipsoid selection, each with its accuracy stated • Neighbouring-zone override at zone boundaries, and your own copy formats WHY ONE PRICE AND NOT A SUBSCRIPTION Geodesy has not changed since the datums were defined, so the price does not recur either. Zonepoint asks once, and the unlock is permanent. The purchase restores, and it is enabled for Family Sharing. HONEST ABOUT ACCURACY Every conversion states its own accuracy in metres rather than presenting a number with no error budget. Zonepoint is a tool for working in the field. It does not replace a survey. PRIVACY No account, no sign-in, no analytics, no tracking, no ads. There is nothing to transmit, because everything stays on the device. The only connection the app ever opens is the download of a map pack you asked for – and nothing is uploaded. Map data © OpenStreetMap contributors, ODbL. World overview: Natural Earth.