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eelcocramer / node-gpsd

Node.js gpsd client for GPS tracking device.

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Speed parameter not the same as cgps

jonathanwiesel opened this issue · comments

commented

I've been testing the library and been monitoring the speed capture from both node-gpsd and linux's cgps. I noticed node-gpsd captures the speed parameter like 3.5 parts less than cgps.

For example, going around 50 Km/h, cgps captures the speed pretty accurately; however node-gpsd captures around 10-15. This number doesn't seem right, not even in miles per hour. Any ideas?

commented

Hi. gpsd captures the speed in MPS. As node-gpsd is just a wrapper, all data received from gpsd is passed to calling script. xgpsspeed does convert the MPS value to KPS, MPH or KNOTS.

You might want to do the same in your program. To convert MPS to KPH multiply the speed value with 3.6 (which is around the same value you found).

Does this help?

commented

Oh!, that makes a lot of sense now. Thanks a lot @eelcocramer