Greek coordinates

From GPS to GGRS87 (ΕΓΣΑ87), HTRS07 (HEPOS) and the HATT sheets of the Hellenic Army Geographical Service maps, and back again, plus the locator. Handy for SOTA, portable and emergency work.

From

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Latitude φ (°) Longitude λ (°)

Decimals with a point or a comma. For WGS84, degrees-minutes-seconds work too, e.g. 40 38 24.4. HATT sheet names are in Greek, as on the maps.

Result

System	Values
Enter a point and press “Convert”.

Many points

one point per line, in the system chosen above

Two numbers per line, separated by a space, comma or semicolon. For HATT, add the sheet at the end of the line.

#	WGS84 φ, λ	GGRS87 E, N	HTRS07 E, N	HATT x, y, sheet	Locator

The transformations come from SV2RIM’s coords.sv2r.im: a JavaScript port of D. Papadimitriou’s tool (themos-sa.gr/proj), with HATT coefficients by G. Gianniris, the HEPOS correction grid (hepos.gr) and sheet boundaries from survgr (MIT). No accuracy guarantee: check anything that matters.