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SignalK / specification

Signal K is a JSON-based format for storing and sharing marine data from different sources (e.g. nmea 0183, 2000, seatalk, etc)
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Support for shaft rpm and remote control throttle position #593

Open pbegg opened 3 years ago

pbegg commented 3 years ago

Working with some voyage data recorders and a couple of extra paths I think could be added that would be useful.

/vessels/<RegExp>/propulsion/<RegExp>/shaft/revolutions Units: Hz (Hertz) Description: Shaft revolutions (x60 for RPM)

It would be useful to have a positive and negative value for shaft direction (CW or CCW)

/vessels/<RegExp>/propulsion/<RegExp>/remoteControl/throttlePosition Units: Ratio -1 to 1 Description: Throttle Position, -1<=ratio<=1, 1 is 100%

Shaft rpm is helpful for determining whether or not the gear box has engaged. An example is a master is coming into a wharf and goes to select astern, the throttlePosition shows that the lever has been moved to the astern position but shaft rpm is still showing a positive (or 0) value and astern gear has not been engaged.

What are everyone's thoughts

tkurki commented 3 years ago

Just a quick comment: existing similar paths are revolutions - rpm in Hz is a bit of a wtf...

pbegg commented 3 years ago

That was a copy and paste mistake. I agree and have edited the original post.

hwater commented 3 years ago

But don´t forget this, even if it is called RPM: It would be useful to have a positive and negative value for shaft direction (CW or CCW)