Mario Behn wrote:
> Hi,
>
> I'm using the Motorola Oncore successfully with NTP. However in addition
> to get my PC clock synchronized, I also want to get my position.
> Since I want to mount the GPS will be mounted on a vehicle, I
> will have to continuously have to log the position to a file, to trace my
> path.
>
> In general:
> - What are the issues involving time and position retrieval from GPS
> on a moving? How can I practically speaking extract the position
> information to an ASCII file?
>
> Thanks for any hints or thoughts.
>
> Mario

Timing and navigation have different requirements! Generally, the GPS
hardware used for navigation is not very good at timing and vice versa.
NTP software is not designed for navigation.

For navigation I would suggest DeLorme Street-Atlas USA with DeLorme's
current GPS receiver. Your mobile PC (Laptop?) will know what time it
is but not quite as well as a fixed GPS system designed for timing. I
believe that there is a Rand-McNally product as well but I've never used
it and know nothing about it other than a vague rumor that it exists.


Use your Oncore in a fixed location for timing.

>>>>> "Mario" == Mario Behn writes:

Mario> I'm using the Motorola Oncore successfully with NTP. However in
Mario> addition to get my PC clock synchronized, I also want to get my
Mario> position. Since I want to mount the GPS will be mounted on a
Mario> vehicle, I will have to continuously have to log the position
Mario> to a file, to trace my path.

Have a look at gpsd (cf http://gpsd.berlios.de/). It is designed for
that, and can provide the tracking data to other apps, such as moving
maps, et al. It can even act as a client of a PPS signal and provide
the tod and pps info to ntpd via the shared mem reference clock (#28).

That's the how. I'll leave the how well for someone who has had the
opportunity to actually try it out. (I'm gps-less at the moment....)

-JimC
--
James Cloos OpenPGP: 0xED7DAEA6
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> Hi,
>
> I'm using the Motorola Oncore successfully with NTP. However in addition
> to get my PC clock synchronized, I also want to get my position.
> Since I want to mount the GPS will be mounted on a vehicle, I
> will have to continuously have to log the position to a file, to trace my
> path.
>
> In general:
> - What are the issues involving time and position retrieval from GPS
> on a moving? How can I practically speaking extract the position
> information to an ASCII file?
>
> Thanks for any hints or thoughts.
>
> Mario

For the level of imprecision that NTP requires using
an Oncore for both navigation and timing should work
fine. Just make sure not to set the receiver in zero-D
mode.

/tvb