National Grid Systems Around the World
Most of the world's maps ride either UTM or a national grid — a projection tuned to one country's shape so its maps stay accurate and its coordinates stay convenient. This atlas tours the majors: the five with live converters on this site (Britain, Ireland, Australia, New Zealand, Switzerland), plus Sweden's SWEREF99, France's Lambert-93, Japan's plane zones, and the UTM-and-be-done countries like Canada and Norway. Different uniforms, one family of mathematics.
Why countries roll their own grid
UTM's 6°-wide zones are a fine global compromise, but a compromise all the same: countries that straddle zone seams get coordinate jumps in awkward places, and a projection centred for the world isn't centred for you. A national grid fixes both — pick your own central meridian, stretch or shrink the zone to swallow the whole country, choose false origins so every coordinate is positive and instantly recognisable. The mathematics is almost always the same Transverse Mercator engine UTM uses; only the constants are patriotic.
The five with live converters here
Britain's OS National Grid pairs two-letter squares with a 1936 datum story worth knowing. Ireland runs the single-letter Irish Grid and modern ITM side by side, border-free. Australia's MGA simply is UTM on the GDA2020 datum — with a moving-continent twist. New Zealand fused its two awkward UTM zones into single-zone NZTM2000. Switzerland (with Liechtenstein) counts metres from the old Bern observatory in LV95, eastings led by a 2, northings by a 1. Each converter states its accuracy honestly and runs offline.
Sweden: SWEREF99
Sweden's answer is SWEREF99 — its national realization of Europe's ETRS89 frame. The workhorse projection, SWEREF99 TM, is a single Transverse Mercator zone on central meridian 15°E covering the whole elongated country, tailor-made for national datasets. For large-scale municipal work, twelve local variants (named by their meridian, like SWEREF99 18 00) keep distortion tiny town by town. It replaced the older RT90 grid, whose coordinates differ enough that mixing the two without converting is immediately visible on a map.
France: Lambert-93
France is wider than it is tall, so Transverse Mercator is the wrong shape — instead, Lambert-93 uses a Lambert Conformal Conic on the RGF93 datum: standard parallels at 44°N and 49°N hug the hexagon, the origin sits at 46°30′N, 3°E, and false origins of 700,000 / 6,600,000 keep the numbers positive and unmistakable. It replaced the four ageing NTF-era Lambert zones, and for very large-scale work nine "CC" conic zones (CC42–CC50) tile the country north to south. If a French coordinate's northing starts with a 6 and has seven digits, you're almost certainly looking at Lambert-93.
Japan, Canada, Norway — and the UTM-and-done countries
Japan splits its arc of islands into 19 plane rectangular zones on the JGD2011 datum — small zones, tiny distortion, one per region. Canada went the other way: too vast for bespoke zones, its NTS topo maps simply print UTM on NAD83. Norway and most of the Nordics likewise map on UTM zones 32–35, and the United States pairs State Plane systems for engineering with USNG for emergency response. The pattern across the atlas: long thin countries invent a zone, wide countries go conic, huge countries surrender to UTM.
The ETRS89 umbrella — Europe's shared anchor
A quiet pattern under the European entries: ITM, LV95, SWEREF99 and RGF93 all anchor to ETRS89, a frame pinned to the Eurasian plate in 1989. Because the plate itself creeps ~2.5 cm a year, ETRS89 has drifted from global WGS84 ever since — approaching a metre by the mid-2020s. Within Europe nobody notices (everything drifts together, which is the whole point); it only surfaces when centimetre-grade global coordinates meet European national ones. For everyday use, treat them as equal — every converter here already does, and says so.