[TG] [TG11] No radar overlay on Axiom/Quantum 2

[Tom - Raymarine - Moderator]

Hello unixdood,

Heading data, from the sound of it. The radar data is oriented to the bow whereas the chart is oriented to north, and the system needs a way to relate one to the other. If you don't have an autopilot or other source of heading data then you can use GPS COG instead (by selecting Use radar without heading data in Menu > Settings > Advanced in the Chart app, but you should be aware that:

1. this will only work when you're under way fast enough to generate reliable COG data
2. COG is the direction you're moving (whereas heading is the direction your bow is facing) and if there's any leeway or tide or you're making heading changes, your radar will not line up with your chart. Personally I'm not a fan of radar-chart overlay from COG, I think radar-chart overlay without good-quality heading is counter-productive, but it's there if you want it.
   

Regards,
Tom