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

From: Roger Oberholtzer
Subject: Re: [gpsd-users] Garmin 18X-5Hz
Date: Thu, 18 Aug 2016 06:05:21 +0000

From: Gary E. Miller address@hidden

>> All the receivers I listed do NMEA as well as PPS.  There is no longer any 
>> need to pay thousands of dollars to get excellent performance.

> Actually, them's fighting words on time-nuts.  But for our purposes I agree.

The GPS receivers we have usually used also have an INS. We need accurate 
(sub-meter) locations even when the GPS are not good. These systems use a 
Kalman filter and the GPS is just one part of the solution. Obviously, with the 
low-cost devices, locations will be less accurate.  But that is okay. It is the 
less strict location requirement that makes this class of device something we 
can provide. But we still need decent time sync. So a PPS is a requirement.

Roger Oberholtzer

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