PhOG, School of Marine Science, University of Maine Welcome to the Gulf of Maine CODAR Page at the University of Maine
Physical Oceanography Group
School of Marine Sciences
University of Maine

Receive Antenna, Green's Island
Total Vector Image
Green's I. transmitter antenna

Coastal Ocean Dynamics Applications Radar, or CODAR, is a land based high frequency (HF) Radar system used for measuring sea surface current. Measurements can be made at long range, across wide areas, using a single instrument. The Gulf of Maine CODAR stations (supported by NERACOOS) use Long-Range SeaSonde, an instrument anufactured by Codar Ocean Sensors. The photos above show a receiver antenna (left), a transmitter antenna (right) and an image of a current vector map produced from data collected at two CODAR stations (center). Click the center image to view the latest total vector plot.

The University of Maine maintains, operates, and distributes data to the national HF-Radar network from their three long-range HF CODAR stations in the Gulf of Maine. The sites are located on Greens Island in southern Penobscot Bay (mid-coast Maine), Grand Manan Island in New Brunswick, and Cape St. Mary in southwest Nova Scotia. A data-sharing partnership has been set up with OEA Technologies in Halifax, Nova Scotia to provide expanded coverage of the eastern Gulf of Maine region with their site at Clarke's Harbour in southern Nova Scotia. Data from these sites are being used to provide synoptic surface current information to the Canadian Forces Meteorology and Oceanography Centre, Halifax and the Joint (Canadian Coast Guard/Canadian Forces) Rescue Coordination Centre (JRCC)in Halifax and its partnering agencies.

The map (right) displays the approximate locations of Gulf of Maine CODAR site operated by University of Maine (blue) for NERACOOS.  Sites operated by OEA Technologies for the Canadian Coast Guard are shown in red.  The radial lines diverging from each each site denote the expected coverage area and range of each radar.  When all sites are operational, hourly current vector maps will be produced for all regions where two or more sites coverage areas overlap.  As of April 2010, three NERACOOS CODAR installations are in operation (Greens Island, Cape St. Mary, and Grand Manan Island, shown in blue).   Gulf of Maine CODAR Location Map

Operational Status

Site Name Latitude Longitude Status Latest Event Comments
Cape St. Mary, Nova ScotiaCSTM44 05.2 N66 12.7 WFully Operational2012-06-17Performed Antenna Pattern Measurement, and installed new pattern.
Grand Manan, New BrunswickGMNB44 36.0 N66 54.3 WFully Operational2015-06-24 Reset Ethernet Power Switch to restore Comm's
Greens Island, Penobscot Bay, MaineGRNI44 01.5 N68 51.6 WFully Operational2013-07-16Ran OSX Updates

Total and Radial Vector Plot Archive

Total Vector Plots
Radial Vector Plots (April 2010: temporarily unavailable)

Links of Interest and Further Information:

CODAR Ocean Sensors
National HF Radar Site
Rutger's Cool Room Codar Data
Questions? Contact the Webmaster

NERACOOS Home Latest Buoy Data U.Maine Buoys U.Maine CODAR GOM Weather GOM Wave Modeling Related Links Software Mooring Group PhOG home