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 the Chief Surveyor.

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 the Survey Section.