Expedition Navigation Software
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You are probably shading something like wind speed.
You can select this in the optimal routing display settings.
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I did try turning different things on & off in display settings,
but still can't find the correct setting.
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It is in the Optimal routing settings drawing page.
Near the top right, called 'Shade'
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That was it, mystery explained.
Thanks for helping sort this out for me.
Cheers, Merrick
Sailing back from Hawaii, about 750Kn out of SF Bay Area.