GPS Diagnostics

GPS problems include loss of power or signal failure or poor GPS data reception that prevents the GPS from acquiring a fix. Signal failure can result from an intrinsic problem with the ROV, GPS or connecting it to the wrong port on the communications module. Poor reception can result from being submerged or having overhead obstructions.

GPS problems can lead to other system issues such as the inability to achieve a starting location for navigation purposes.

GPS diagnostic tools include the the GPS hardware LED status indicators, Greensea Diagnostics Panel (Positioning), Greensea Advanced Diagnostics Panel (Process View tab), flighthack tools and a multimeter.

Diagnostic Table

If unable to resolve a problem, contact VideoRay Support and report efforts and results.

Issue	Items to Check	Status / Resolution
Lack of power	Check GPS cable.	Reconnect or replace cable.
	Check power from communications module port.	See communications port connector pinout.
No GPS Data	Check that the Greensea Diagnostics Panel (Position)	Check the timestamp for connectivity
	Check that the GPS is connected to the correct port on the communications module.	Connect the GPS to the correct port or change the port configuration on the communications module.
	Check Greensea Advanced Diagnostics panel Process View, rov_gps.	Click on checkbox for rov_gps and check data stream.
No GPS Lock or wandering position	If data streaming is functioning, allow ample time for the GPS to resolve the position.	Wait for the GPS signal to stabilize. This may take several minutes for the GPS to download the satellite ephemeris data.
	Check Greensea Advanced Diagnostics panel Process View, rov_gps.	Click on checkbox for rov_gps and check data stream for the GLL string.
	Check the location of the GPS - it cannot be submerged (even on the surface can result in reduced performance). Additionally, overhead obstructions can interfere with getting a GPS lock.	Move the GPS to a position above the water surface and free from overhead obstructions.

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