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

[Robin Schwab]

Dear Gary

Am 14.08.2016 um 19:42 schrieb Gary E. Miller:
> You are using the 22 driver, and I, and the howto's, use the 28
> driver.  Once again the 22 driver usually works, but it lacks the
> fail safes in the 28 driver chain.

Not being a software engineer I am confused by the many drivers that are 
around. 90% are probably obsolete but not marked as such. Or am I wrong 
and there are still thousands of Trak 8820 users around?

Which driver shall one use? 20,22, 28, and 46 are candidates for a 
modern setup with NEMA and PPS. But I do not find information which one 
to prefer and which NEMA sentences they need to work best. I.e. a driver 
could use DOP data to trust good fixes more than average ones and to 
even discard very bad fixes. That is probably what you mention as fail 
safes Gary. As far as I know, diver 46 is the most recent and the only 
one to consider DOP. Are the howtos out of date?

Regards

Robin