The geodetic control infrastructure of the Cayman Islands is currently based on three Continuously Operating Reference Stations (CORS); one on Cayman Brac (CBSB) and two on Grand Cayman (GCFS and GCEA).

Data are stored in both RINEX and DAT file format and is available free for post processing or via a subscription package for real time corrections.

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			NAD83(CORS96)	NAD83(CORS96)	CIGD11
Datum Transformation			SI7P-NAD83(CORS96)-SIGD61	SI7P-NAD83(CORS96)-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			Available 2011	Available 2011	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 CIGD11GCGD59 and UTM projection parameters for zone 17 north are required.

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

Sister Islands:

NAD83(CORS96) is in use on the Sister Islands. Conversion to CIGD11 is planned for 2011.

In order to convert GPS latitude, longitude, heights referenced to NAD83(CORS96) into the current Sister Islands national grid (SING61), the seven parameter transformation SI7P-NAD83(CORS96)-SIGD61 and UTM projection parameters for zone 17 N are required.

Comments and Questions:

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