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Dirk Stichling | 31 May 2012 18:31

Problem with NMEA file from Canon GP-E2

Hi.

I have a NMEA file created by a Canon GP-E2 GPS logger:
http://www.mytracks4mac.com/tmp/canon.log

I tried to convert it to a GPX file using gpsbabel but no track points have been converted. I am not that
familiar with NMEA and wasn't able to identify the reason.

Can anybody help?

Thanks,
Dirk

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Thorben Thuermer | 1 Jun 2012 01:02

Re: Problem with NMEA file from Canon GP-E2

On Thu, 31 May 2012 18:31:27 +0200 Dirk Stichling <mytracks4mac <at> me.com> wrote:
> I have a NMEA file created by a Canon GP-E2 GPS logger:
> http://www.mytracks4mac.com/tmp/canon.log
> 
> I tried to convert it to a GPX file using gpsbabel but no track points
> have been converted.
> I am not that familiar with NMEA and wasn't able to identify the reason.
> 
> Can anybody help?

no expert here, but as nobody else answered - i just tried, and found:
all data in the file is ignored, apparently because your gps indicates it
does not have a fix (yet).
see: http://aprs.gids.nl/nmea/#gga

if i edit your file to put a "1" in the empty spot after ,E,:
$GPGGA,053231.858,5000.7781,N,00820.6831,E,,04,1.6,91.0,M,,,,0000*0C
=>
$GPGGA,053231.858,5000.7781,N,00820.6831,E,1,04,1.6,91.0,M,,,,0000*0C

gpsbabel will generate output for that entry:

$ gpsbabel -i nmea -f canon.log -o gpx -F /dev/stdout 
<gpx
[...]
<trkpt lat="50.012968333" lon="8.344718333">
  <time>2012-05-24T14:40:28Z</time>
[...]

> Thanks,
(Continue reading)

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Tom Paton | 1 Jun 2012 01:29
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Re: Problem with NMEA file from Canon GP-E2

Hi,

Two possible options (sorry, I can't test on your file from here):

1) Add the gps fix data in with the track filter:
  gpsbabel -i nmea canon.log -x track,fix=3d -o gpx -F -

2) Convert waypoints to a track:
 gpsbabel -i nmea canon.log -x transform,trk=wpt,del -o gpx -F -

Hope that helps.

Tom

On Fri, Jun 1, 2012 at 9:02 AM, Thorben Thuermer <r00t <at> constancy.org> wrote:
> On Thu, 31 May 2012 18:31:27 +0200 Dirk Stichling <mytracks4mac <at> me.com> wrote:
>> I have a NMEA file created by a Canon GP-E2 GPS logger:
>> http://www.mytracks4mac.com/tmp/canon.log
>>
>> I tried to convert it to a GPX file using gpsbabel but no track points
>> have been converted.
>> I am not that familiar with NMEA and wasn't able to identify the reason.
>>
>> Can anybody help?
>
> no expert here, but as nobody else answered - i just tried, and found:
> all data in the file is ignored, apparently because your gps indicates it
> does not have a fix (yet).
> see: http://aprs.gids.nl/nmea/#gga
>
(Continue reading)

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