

Possible routes on the Map tab

I can't find any explanation for the various lines on the Map tab.
1. Red I assume is the constant heading line
2. Green is the constant wind angle line
3. But what is the blue line which is close to the red line?
4. On the suggested route the black line with the course change points is pretty obvious I hope! But in some places the is a red line which closely tracks the black line. What does that show?
Apologies for ignorance but I've only just started using zezo.
Rby


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