npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

signalk-derived-data

v1.35.0

Published

Plugin that derives signalk data from other signalk data

Downloads

277

Readme

signalk-derived-data

Generates deltas for values derived from signalk values

It currently calculates:

  • Outside air density (based on humidity, temperature and pressure)
  • Battery Power
  • Depth Below Keel (based on depth.belowSurface and design.draft.maximum)
  • Depth Below Keel (based on depth.belowTransducer and depth.transducerToKeel)
  • Depth Below Surface (based on depth.belowKeel and design.draft.maximum)
  • Distance To Go (based on courseGreatCircle.nextPoint.position)
  • Outside air dew point (based on humidity and temperature)
  • Fuel economy (based on speed over ground, fuel rate)
  • Propeller Slip calculation (requires defaults.json to include propulsion.*.drive.propeller.pitch and propulsion.*.transmission.gearRatio)
  • Sets environment.sun to dawn, sunrise, day, sunset, dusk or night (based on navigation.datetime or system time and navigation.position)
  • Tank Volume (based on currentLevel (requires calibration pairs (>2 for parallell sides, >3 for straight wedge and >4 for more complex shapes))
  • Velocity Made Good to Course (based on courseGreatCircle.nextPoint.bearingTrue heading true and speedOverGround)
  • Velocity Made Good to wind (based on wind.directionTrue and speedOverGround)
  • Set and Drift (based on headingMagnetic, courseOverGroundTrue, speedThroughWater, speedOverGround, magneticVariation)
  • Outside air wind chill (based on wind speed and temperature)
  • True Wind Angle, Direction and Speed (based on speed through water, AWA and AWS)
  • True Wind Direction (based on AWA and headingTrue)
  • Ground Wind Angle and Speed (based on SOG, AWA and AWS)
  • Magnetic Wind Direction (based on AWA and headingMagnetic)
  • Magnetic Wind Direction (based on wind.directionTrue and magneticVariation)
  • Wind Shift (experimental)
  • Moon illumination and times (based on time and navigation.position)
  • Sunlight Times: sunrise, sunriseEnd, goldenHourEnd, solarNoon, goldenHour, sunsetStart, sunset, dusk, nauticalDusk, night, nadir, nightEnd, nauticalDawn, dawn (based on time and navigation.position)
  • Outside Heat Index (based on temperature and humidity)
  • True Course Over Goround (based on courseOverGroundMagnetic and magneticVariation)
  • Magnetic Course Over Ground (based on courseOverGroundTrue and magneticVariation)

To add new calculations, just create a new file under the ./calcs directory.

For example. This is the VMG calculator.

module.exports = function(app) {
  return {
    group: 'vmg',
    optionKey: 'vmg',
    title: "Velocity Made Goog (based on courseGreatCircle.nextPoint.bearingTrue heading true and speedOverGround)",
    derivedFrom: [ "navigation.courseGreatCircle.nextPoint.bearingTrue",
                   "navigation.headingTrue",
                   "navigation.speedOverGround" ],
    calculator: function (bearingTrue, headingTrue, speedOverGround)
    {
      var angle = Math.abs(bearingTrue-headingTrue)
      return [{ path: "navigation.courseGreatCircle.nextPoint.velocityMadeGood",
                value: Math.cos(bearingTrue-headingTrue) * speedOverGround}]
    }
  };
}