C120W chart spins in circles

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum kkosciusko,

It sounds as though you may be having an issue with the heading data produced by the autopilot system. Please click here to view a FAQ addressing this subject. Please additionally note that within this generation of MFDs, the Chart was designed to orient based on COG data. Should the vessel be stationary or maneuvering at very slow speed, then random COG may result in seemingly random rotation of the chart. Accordingly when maneuvering or stationary and such rotation occurs, then it is recommended that the MFD be configured to North-Up chart orientation. The generation of MFDs which followed the C/E-Series Widescreen MFDs will instead orient to heading (when present) rather than COG. In systems lacking a heading source, the generation of MFDs which followed the C/E-Series Widescreen MFDs will automatically revert to North-up chart orientation when the vessel be stationary or maneuvering at very slow speed.