I hope this link works. It should lead to a short video. On a broad reach a couple of years ago, my BiData display showed 7.2-7.3 and my chartplotter showed 7.4-7.5, knots. This on a C&C30 mk1
https://1drv.ms/u/s!AkpvkGQ7RaWRhud6F4LdwC8_OFTfoA Derek 1979 C&C30 mk1, Tortuga Ballantyne's Cove, NS
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