QTH locator and coordinates
The locator describes a location in a few characters, for example JO50HB. The calculator works both ways: type in a locator and read latitude and longitude, or enter coordinates and get the locator.
Locator and coordinates
Works both ways. Six characters describe a square of about 4.6 ร 5.8 km.
waiting for input
How the page calculates
- Longitude: field = โ(ฮป + 180ยฐ) / 20ยฐโ (A to R), square = โrest / 2ยฐโ (0 to 9), subsquare = โrest / 5โฒโ (a to x)
- Latitude: field = โ(ฯ + 90ยฐ) / 10ยฐโ (A to R), square = โrest / 1ยฐโ (0 to 9), subsquare = โrest / 2.5โฒโ (a to x)
- Centre = corner + half the field size (2.5โฒ in longitude, 1.25โฒ in latitude)
- Subsquare: north-south = 2.5โฒ ร 111.2 km/ยฐ โ 4.6 km, east-west = 5โฒ ร 111.2 km/ยฐ ร cos ฯ
From a locator the page works out the centre of the square, the middle of the rectangle the locator describes. The other way round it gives the six- and four-character locator for coordinates. In Germany (51ยฐ north), four characters describe a square of about 111 km north-south by 140 km east-west, six characters about 4.6 by 5.8 km.
If you've already saved a location on afu.tools, it's in the field when you open the page.
Related terms
- Locator
- Maidenhead code for a location, for example JO50HB. Four characters describe a square of about 111 by 70 km, six characters about 4.6 by 2.8 km.