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VMG relative to wind - with a rotating mast


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This is a bit of the thought experiment, as I probablly have better things to spend a load of cash on, than try to get a reliable VMG to windward on my insruments, but we can all dream

 

Current setup - 8.5 Multihull, with rotating mast.

No mast head gear, no paddle wheel, just raymarine A60 charplotter on NEMA 2000

 

What I am thinking is using something like calypso cups (or the vavuud) as masthead gear, then their bluetooth to NEMA0183 gateway, then a 0183 to 2000 converter.

I like the look of these as they incorporate a compass into the mast gear, so the rotation of the mast is irelevent. (sailtimer did something similar, but I've not heard great things about them)

However, bluetooth to 0183 to 200 seems like a lot of interfaces and sounds like a recipe for multiple places for problems to hide.

 

The alternative is to go with a more traditional masthead gear, then add something onto the mast to measure rotation, but even the cheap gear out there for this seems madly expensive, and is going to need some very careful calibration.

 

Any other suggestions on how to get decent wind information on a rotating mast?

 

 

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Nope, only one bluetooth connection allowed. And their app doesn't know which way the boat is pointing, there is a calibration mark on the sensor for pointing of towards the bow.

Hence why I want the NMEA sentences so my daylight viewable chart plotter can actually use the information properly

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