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Fishbrain – What does the blue and grey mean on Depth Contour map?

Fishbrain has a partnership with Navico, and we are using their social maps (known as C-Map) which is crowdsourced data.The blue coloured depth contours are based on users reporting in depths from their plotters. The grey areas are based on data from other sources (still from C-Map), and can have less resolution and accuracy.

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