Geodetic System

The geodetic control infrastructure of the Cayman Islands is currently based on four Continuously Operating Reference Stations (CORS); one in Cayman Brac (CBMD), one in Little Cayman (LCSB) and two in Grand Cayman (GCFS and GCEA).

Data are stored in RINEX format and are available free for post processing. Real time corrections for RTK surveying are available as a subscription package.

For more information on subscribing for real time corrections, please contact Michael Whiteman.

Geodetic System by Island:

  Download
(xls)
Info
(pdf)
Cayman
Brac
Little
Cayman
Grand
Cayman
Global Geodetic Datum   CIGD11 CIGD11 CIGD11
Datum Transformation   CIGD11-SIGD61 CIGD11-SIGD61 CIGD11-GCGD59
Local Geodetic Datum   SIGD61 SIGD61 GCGD59
Projection TM (UTM Zone 17N) TM (UTM Zone 17N) TM (UTM Zone 17N)
National Grid     SING61 SING61 GCNG59
Vertical Datum     CBVD61 LCVD61 GCVD54
Geoid Model     CBGM0811 LCGM0811 GCGM0811

Downloads of relevant files in formats commonly used by GPS/GIS software are available on the User Support Page.

Grand Cayman:

The Cayman Islands Geodetic Datum 2011 (CIGD11) is in use on Grand Cayman. CIGD11 is based on ITRF05(2011.0) positions.

In order to convert GPS Latitude Longitude Heights referenced to CIGD11 into the current Grand Cayman national grid (GCNG59), the seven parameter transformation CIGD11-GCGD59 and UTM projection parameters for zone 17 north are required.

The Grand Cayman Geoid Model (GCGM0811)  facilitates GNSS observation of ground elevations. Expected accuracy is 0.1 feet RMSE.

Sister Islands:

The Cayman Islands Geodetic Datum 2011 (CIGD11) is in use in Cayman Brac and Little Cayman. CIGD11 is based on ITRF05(2011.0) positions.

In order to convert GPS latitude, longitude, heights referenced to CIGD11 into the current Sister Islands national grid (SING61), the seven parameter transformation CIGD11-SIGD61 and UTM projection parameters for zone 17 N are required.

Both the Cayman Brac Geoid Model (CBGM0811) and the Little Cayman Geoid Model (LCGM0811) are now in use on their respective islands. Expected accuracy of GNSS observed elevations is 0.1 feet RMSE.

Comments and Questions:

For Queries relating to the Cayman Islands Geodetic System contact Anthony.Watts@gov.ky