[CA] [CA11] Jumping display c90w

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Ragnar,

Unfortunately, the Chart application of early Raymarine MFD designs such as the C-Series Widescreen MFDs orients the cartography displayed with the Chart application to GPS COG when the Head Up chart orientation is selected. When so configured, the vessel icon will be oriented to Heading (if interfaced to the autopilot or other heading source) or to COG (when not interfaced to the autopilot or other heading source). When the vessel is stationary or operating at slow / maneuvering speeds, the random error of the GPS will report minor sensed movements of the vessel to the system. Each such reported movement will have a COG associated with it. This sensed change in COG will cause chart screen to be re-oriented and offset in response to the sensed motion. Accordingly, when the vessel is stationary or operating at very slow (ex. maneuvering speed), it is recommended that the Chart orientation be configured to North-Up and that vessel offset setting be configured to 0 to avoid such re-drawing of the chart.