Question 1

How to parse NMEA data from a serial port with GPS.js in Node.js?

Accepted Answer

Use the 'serialport' npm package to read data and pass it to gps.updatePartial(). The README includes an example setting up a serial port with the correct baud rate and delimiter for real-time parsing.

Question 2

GPS.js vs nmea-parser: which should I use for my project?

Accepted Answer

GPS.js is better for real-time applications with its state object and event API, while nmea-parser might be simpler for basic parsing. GPS.js includes utilities like distance calculation, which nmea-parser may not offer.

Question 3

Can I use GPS.js to get altitude and speed from GPS data?

Accepted Answer

Yes, the gps.state object includes 'alt' for altitude and 'speed' for speed over ground, updated automatically as NMEA sentences like GGA and RMC are parsed.

Question 4

How to calculate the distance between two coordinates using GPS.js?

Accepted Answer

Use the static method GPS.Distance(latFrom, lonFrom, latTo, lonTo) which implements the Haversine formula. For example, GPS.Distance(50, 10, 51, 9) returns the distance in kilometers.

Question 5

Does GPS.js support parsing NMEA data from a file or string?

Accepted Answer

Yes, you can use gps.update() with a complete NMEA sentence string, or GPS.Parse(line) for single-line parsing without callbacks, as described in the functions section of the README.

Question 6

Is GPS.js suitable for building a real-time tracking dashboard?

Accepted Answer

Absolutely, the event-driven API and state object make it ideal for live updates. The examples folder includes a dashboard that visualizes gps.state in real-time using a web server.

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