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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We're available: Monday - Sunday 9 AM-6 PM CT.