EPSG:6129 · Cayman Islands
Sister Islands National Grid 1961 to KML & KMZ
Sister Islands National Grid 1961 (EPSG:6129) is a Transverse Mercator coordinate system on the Sister Islands National Grid 1961 datum, with coordinates in international feet. Its official area of use is: Cayman Islands - Little Cayman and Cayman Brac.
- Converter already set to EPSG:6129
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
Loading converter…
Good to know
- Coordinates are in international feet. Enter them in those units, not metres.
- Datum: Published 7-parameter shift (typically 1–2 m).
Convert a whole spreadsheet
- Open the web app or the Windows app, and paste your rows from Excel or open a CSV file.
- Under Coordinate system, search for “6129” and pick Sister Islands National Grid 1961.
- Check one point you know on the map, then press Save KML or Save KMZ and open it in Google Earth.
Common mistakes with Sister Islands National Grid 1961
- Metres entered as feet. Sister Islands National Grid 1961 is in international feet. Enter the values as they are; converting them to metres first puts every point in the wrong place.
- Forgetting the datum. Sister Islands National Grid 1961 is not on WGS 84: published 7-parameter shift (typically 1–2 m). Picking a WGS 84 grid with the same projection instead leaves the points off by that amount.
- Points outside the grid's area. Sister Islands National Grid 1961 is meant for Cayman Islands - Little Cayman and Cayman Brac. Points well outside that area convert with growing error; the converter flags them so you can choose the right grid.
- A local site grid. If every point is off by the same distance and direction, the drawing may be on a local site grid. Calibrate on three or more known control points instead.
New to this? Read how to convert easting and northing to latitude and longitude.