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Re: [gpsd-users] Garmin 18X-5Hz

From: David J Taylor
Subject: Re: [gpsd-users] Garmin 18X-5Hz
Date: Sat, 13 Aug 2016 10:26:42 +0100

Hello Gary
Your graphs are by characteristic very similar to what I got with a
raspberrypi 2 and the adafruit GPS. I got much better on an absolute
scale but the sawtooth-like waveform remains. Strange thing: It can
happen that the periodic error disappears but it's unclear to me under
which circumstances. Without the periodic error I could stretch the
graph to -+10 us which is imo pretty good for a 100$ hardware setup.

Big advantage of the adafruit: You can set NEMA update rate and UART
baud rate separately.



Robin, Gary,

I recently did some tests with the tickless/not setting, and found that using "nohz=off" on the Raspberry Pi's /boot/cmdline.txt could produce a worthwhile improvement in offset and jitter. More details and some results:

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