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 🙏

© 2026 – Pkg Stats / Ryan Hefner

signalk-to-stalk

v2.0.3

Published

Signal K server plugin and read-only WebApp converting navigation data to SeaTalk1 with coherent settings, waypoint, units, lights, diagnostics, and calibration advice

Downloads

677

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

uniparthenopeuniparthenope

Keywords

signalk-node-server-pluginsignalkseatalkseatalk1stalkmarinewaypointautopilotcourse-apiunitsinstrument-unitssignalk-webappdashboarddiagnosticstelemetrydisplay-lightsbrightnessilluminationcalibrationst60-speed

Readme

signalk-to-stalk

Signal K Node server plugin and read-only WebApp that converts selected Signal K navigation data to SeaTalk1 datagrams wrapped in $STALK NMEA 0183-style sentences. Version 2.0.3 is the stable feature release for the current architecture.

The implementation follows Signal K SI-unit conventions and Thomas Knauf's SeaTalk Technical Reference.

Features

  • Direct datagram conversions for position, speed over ground, course over ground, UTC time, and UTC date.
  • Passive target waypoint guidance using SeaTalk commands 0x82 and 0x85.
  • SeaTalk display-unit synchronization using command 0x24.
  • SeaTalk display-light synchronization using command 0x30.
  • Read-only WebApp monitor with runtime status, counters, recent activity, and calibration advice.

Documentation

Supported conversions

| SeaTalk command | Signal K source | Meaning | |---|---|---| | 0x50 | navigation.position.latitude | Latitude | | 0x51 | navigation.position.longitude | Longitude | | 0x52 | navigation.speedOverGround | Speed over ground | | 0x53 | navigation.courseOverGroundTrue, navigation.magneticVariation | Magnetic COG | | 0x54 | navigation.datetime | UTC time | | 0x56 | navigation.datetime | UTC date | | 0x82 | navigation.course.nextPoint and waypoint metadata | Four-character target waypoint identifier | | 0x85 | navigation.course.calcValues.* | XTE, bearing and distance to target |

Legacy navigation.courseGreatCircle.* and navigation.courseRhumbline.* paths are accepted as fallbacks for waypoint guidance.

Signal K angles are radians, speed is metres per second, distances are metres, and timestamps are UTC-capable ISO-8601 values.

Safety Boundary

Commands 0x82 and 0x85 provide passive route guidance to compatible SeaTalk displays and autopilots. This plugin does not transmit SeaTalk autopilot key commands, engage Track or Auto mode, acknowledge waypoint advances, or alter steering state.

A helmsperson must verify route, bearing, cross-track error, waypoint transitions, and the behavior of the connected Raymarine equipment before relying on the output.

Output events

Every generated sentence is emitted on:

  • stalkout — aggregate output event;
  • stalkout:50, stalkout:82, stalkout:85, etc. — per-command events.

Sentences include a checksum and CR/LF.

WebApp Monitor

After installation and server restart, open Signal K to SeaTalk Monitor from the Signal K WebApps page.

The monitor shows configured features, runtime state, live outgoing datagrams, suppressions, errors, per-command counters, waypoint state, synchronized units, display-light state, and calibration advice. It is read-only.

Development

npm install
npm run check
npm test

References

License

Apache-2.0