missing: Drift - Githubissues

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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missing: Drift #519

Closed Dirk-- closed 5 years ago

Dirk-- commented 5 years ago

Drift (drifting speed relative to ground) navigation.drift
Set (drifting direction relative to true north) navigation.setTrue
Set (drifting direction relative to magnetic north) navigation.setMagnetic

joabakk commented 5 years ago

It's under environment.current. Anything you miss?

Dirk-- commented 5 years ago

DFT and SET is a movement of the vessel ergo in navigation context. Might be caused by environment.current, environment.wind, environment.gravity, ...

environment.current.drift = speed of current relative to ground environment.current.setTrue = direction of current relative to true north

JonRowe commented 5 years ago

In navigational terms, drift and set refer to current/tide, not wind or anything else.

joabakk commented 5 years ago

It is sufficient to have set and drift under environment. Your boat moves in the water, and the water moves under you. That is a result of the environment. The current use is to take the current as derived from speeds and course in e.g. NMEA0183 VDR into environment.current.

Dirk-- commented 5 years ago

got it: https://en.wikipedia.org/wiki/Set_and_drift Excuse my ignorance.

joabakk commented 5 years ago

Nothing to excuse.