Your survey plan has a list of numbers on it. On their own they mean nothing to a phone, a bank or a buyer. Photograph the page and Sentinel Gamma turns those numbers into a map pin you can tap, and two satellite pictures — one of the land itself, one showing what surrounds it.
Minna datum · West, Mid and East Belt · UTM 31–33N → WGS 84 (EPSG:4326)
or click to browse — a photo of the page is fine
New here? Watch a 2-minute walkthrough
| # | Point | Easting | Northing | Grid | Latitude | Longitude |
|---|
Geocentric translation from Minna (Clarke 1880 RGS) to WGS 84. Defaults are the published NIMA values for Nigeria. Change them only if your organisation has adopted its own set — most people should leave this closed.
Tap a link, Google Maps opens on that exact corner. Send it to a buyer, a driver or your lawyer.
WGS 84, written [Latitude, Longitude]
Your plot outlined up close, and a wider shot showing the roads and neighbours around it.
JPG × 2 · area, scale bar, north arrow
Remember: this is a location aid, not a survey — verify against a known control point before relying on it in the field.
Type the numbers from a Nigerian survey plan straight into Google Maps and you will land in the wrong place, sometimes hundreds of kilometres away. The plan measures from a reference point fixed in Nigeria decades ago; your phone measures from the centre of the Earth. Three steps stand between them.
Your plan measures in metres across a flat sheet. The Earth is not flat, so those metres are unwrapped back into angles — a latitude and longitude, though still the old Nigerian ones.
Inverse Transverse Mercator on the belt or UTM zone
Nigeria's survey system and the global one disagree about where the centre of the Earth is, by about 180 metres. This step corrects for that. Skip it and your land sits in the wrong field.
Geocentric shift ΔX −92, ΔY −93, ΔZ +122 m (NIMA)
The corrected position is read out as the latitude and longitude your phone understands, then used to build your pin and pull the satellite picture.
WGS 84 / EPSG:4326, reported to 8 decimal places
Plain language, not legalese — the point is that you actually read it.
We never store your coordinates, your uploaded files, or any image of your land. We keep a technical record of each job — which survey grid was used, how many points, whether anything failed — for 90 days, so we can help if something goes wrong. That record cannot be used to locate your land.
Something not working, or a result that looks wrong? Email — — quoting your job reference (shown throughout the app, e.g. SG-XXXXXX) speeds things up a lot. Email only, for now.
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One point per line. Put the point name first if you have one, then the two numbers, separated by commas or spaces.