[CA] [CA11] EV-1 Cycles 360 Degrees (Even While Docked)

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum dlane1181,

Please note that COG data is derived from GPS data. A vessel has no valid COG when it is stationary (ex. tied to a dock). Accordingly, any attempts to align to COG after the vessel has completed the cruise to determine the deviation sensed by the autopilot must be performed while the vessel is underway and making way on a steady heading. Should the problem occur under such conditions, then please indicate the make/model of chartplotter/MFD is installed onboard? If the chartplotter/MFD/system has been interfaced to an external GPS sensor, please specify the make/model of GPS sensor which has been installed. Finally, when the problem described is observed, please specify the HDOP value reported within the GPS status dialog of the chartplotter/MFD.