[time-nuts] GPS-18x behaving weirdly

Jim Lux jimlux at earthlink.net
Thu Mar 27 18:56:25 EDT 2014

On 3/27/14 8:53 AM, David J Taylor wrote:
> From: Jim Lux
> []
> Has anyone seen a similar behavior?  I've tried the power cycling, and
> the Garmin "reset" command.  I've not done the "clear non-volatile
> memory" which makes it forget the almanac.
> ===============================================
> What firmware are those units running?  Is it the latest?  3.90?  Maybe
> blowing the firmware would reset the position?

yes, running 3.90.. they're only a year old, and 3.90 came out earlier 
than that I think..

In any case, I set one of them to the present lat lon, within a few 
seconds of arc, and it seems to have acquired, changed the fix a bit, 
and then stopped again.

The other one is resolutely stuck.  I'm thinking there's got to be some 
simple option that I'm overlooking.  It's kind of frustrating, because 
there's no NMEA sentence that tells you what the acquisition/search 
status is: just which ones it is trying to track and what the status is 
(unlocked, no data for all of them).

> Otherwise, I do have a simple program for monitoring the serial port:
>   http://www.satsignal.eu/software/net.htm#SerialPortLEDs
I'll try that..

> Cheers,
> David

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