[ntp:questions] semi OT - GPS receiver for BMW automobile on EBay
Ron Frazier (NTP)
timekeepingntplist at c3energy.com
Sat Mar 3 03:46:44 UTC 2012
On 3/2/2012 4:56 PM, Richard B. Gilbert wrote:
> On 3/2/2012 9:55 AM, Ron Frazier (NTP) wrote:
>> Hi all,
>> From my previous threads you know I've been considering upgrading my
>> GPS receiver for NTPD. I found this GPS receiver module for BMW
>> automobiles. I wouldn't know what to do with it if I bought it, but I
>> thought it was interesting. There are a few of these on EBay, hopefully
>> not stolen. I think one of the ads mentioned the name Trimble.
>> Price for this one, $ 63 plus shipping.
> Don't buy it!
> There are two kinds, at least, of GPS receivers. The type you need
> is a GPS TIMING RECEIVER. It's optimized to deliver accurate time.
> The other kind is a navigation receiver. It is optimized for position.
> Both kinds know both the time and the the position, it's the
> presentation that counts. A timing receiver will have Pulse Per
> Second (PPS) output with one edge of the pulse being within something
> like +/- fifty nano-seconds of the time written out in full.
> The navigation receiver outputs your current latitude, longitude, and
> elevation. Connect it to a computer with with the proper software and
> the computer will display a map with "You are here!" and an arrow symbol.
> With the proper software you may be able ask your computer "Where is
> the nearest hospital?" or "Where is the nearest Chinese restaurant?"
I wasn't going to buy that, but thanks for the tip anyway. I wouldn't
know how to hook it up. I guess I have to get it through my head that,
even with something like this which could be considered a premium
product, for BMW no less, it is still not designed for timing. So, our
needs, for timing, are a niche subset of the GPS universe. So, I have
to focus on timing GPS's. Chris Albertson and one or more of the
David's on the list have been similarly advising me. I think I'm
finally starting to get the picture. I.E. - Think TIMING, and only TIMING.
We could make a chant - TI MING ... TI MING ... TI MING. The box
just looked really cool and industrial. Seriously though, thanks for
(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such. I don't always see new messages very quickly. If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)
timekeepingdude AT c3energy.com
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