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Author GPS with tracklog
Sosumi

2008-02-17, 7:33 am

Hi,
Does anyone know of cheaper GPS devices (until 250 euro) that have tracklog
with altitude?

I want to use it for geotagging pictures, but so far I found:

garmin Nuvi 200W: nothing
Navigon 2100: has some logging but nowhere info what is redorded. Not even
in the manual.
Mio 220 230: nope
Acer c530 with Copilot: works but no altitude

Not sure, but do the Tomtom have this? Or other ones?


--
Sosumi


murk

2008-02-17, 7:33 am

"Sosumi":
> Hi,
> Does anyone know of cheaper GPS devices (until 250 euro) that have
> tracklog with altitude?
>
> I want to use it for geotagging pictures, but so far I found:
>
> garmin Nuvi 200W: nothing
> Navigon 2100: has some logging but nowhere info what is redorded. Not even
> in the manual.
> Mio 220 230: nope
> Acer c530 with Copilot: works but no altitude
>
> Not sure, but do the Tomtom have this? Or other ones?


I recently bought a RoyalTek RGM3800 for geotagging photos. Seems to work
fine. Records time, long, lat, altitude and velocity.
http://www.royaltek.com/index.php/content/view/139/104/

You'll find these on Ebay for about EUR 60,- ex. shipping.
http://search.ebay.nl/search/search... /> 0&category0

Groet'n,

Mark


Sosumi

2008-02-17, 7:33 am


"murk" <invalid@invalid.invalid> wrote in message
news:61qpckF211j1eU1
@mid.individual.net...
> "Sosumi":
>
> I recently bought a RoyalTek RGM3800 for geotagging photos. Seems to work
> fine. Records time, long, lat, altitude and velocity.
> http://www.royaltek.com/index.php/content/view/139/104/
>
> You'll find these on Ebay for about EUR 60,- ex. shipping.
> http://search.ebay.nl/search/search... /> 0&category0
>
> Groet'n,


Sounds like a plan! Does it work in the car also (put it on the dashboard or
something)? Not navigate, but does it keep a complete tracklog to use with
other programs as well? I use Geosetter with the Acer (before) and it works
great: tells even the city, sublocation etc. But it took the altitude (not
present in the Acer) from Google maps and that's not accurate at all.

Bedankt!


--
Sosumi


murk

2008-02-17, 7:33 am

underprocessable
Sosumi

2008-02-17, 10:33 am


"murk" <invalid@invalid.invalid> wrote in message
news:61qr1qF1vve3hU1
@mid.individual.net...[color=darkred]
> "Sosumi":
>
> Yup.
>
>
> It exports an nmea file, so I guess so. I've attached a snippet of an
> export file for your information, hope it comes through.
> Weird thing is the altitude has an offset of about +50 meters. My other
> Royaltek GPS receiver does that too. Don't know if that's a Royaltek thing
> or something else. You may want to look into that.
>

OK, that doesn't improve then compared with the Acer and Google maps.

I'll try to find a better one.


pwelten@zonnet.nl

2008-02-17, 12:34 pm

murk schreef:
> "Sosumi":
>
> Yup.
>
>
> It exports an nmea file, so I guess so. I've attached a snippet of an export
> file for your information, hope it comes through.
> Weird thing is the altitude has an offset of about +50 meters. My other
> Royaltek GPS receiver does that too. Don't know if that's a Royaltek thing
> or something else. You may want to look into that.
>
> U is welkom.
>
> Mark
>
>

The 50 meters offset is most likely the difference between the WGS84
definition of the earth's shape and the real sea level. Most gps devices
only report the altitude compared to the WGS84 definition. In the
netherlands, the sea level is roughly 50 meters above the WGS84
definition, but it varies from place to place.

Peter
murk

2008-02-17, 10:33 pm

> The 50 meters offset is most likely the difference between the WGS84

> definition of the earth's shape and the real sea level. Most gps devices
> only report the altitude compared to the WGS84 definition. In the
> netherlands, the sea level is roughly 50 meters above the WGS84
> definition, but it varies from place to place.
>
> Peter


Aha, thanks. Can the offset by any chance be calculated given the
latitude/longitude?

Mark


peter

2008-02-17, 10:33 pm

On Feb 17, 3:52 pm, "murk" <inva...@invalid.invalid> wrote:
>
>
> Aha, thanks. Can the offset by any chance be calculated given the
> latitude/longitude?


Any of the Garmin series of handheld GPS receivers (eTrex series,
Gekos [except 100], 60/76 series, etc.) would seem to satisfy the
original requirements of maintaining tracklogs incl. the time/date and
altitude data. The Garmins also include a lat/long based lookup table
to provide the WGS vs. geoid correction for the altitude data so the
reported altitudes are referenced to the geoid which models sealevel
rather than to the WGS84 ellipsoid shape. The Garmins that take
microSD cards would be particularly suited since they can store the
tracklog data on the card for virtually unlimited storage.

Note that this does not include the Garmin models that are
specifically car-oriented such as the nuvi series, which don't provide
tracklog data. But the Garmin handhelds can be mounted on a car
dashboard and provide automotive navigation in addition to keeping the
tracklogs and georeferencing photos, etc.

pwelten@zonnet.nl

2008-02-18, 4:33 am

murk schreef:
>
> Aha, thanks. Can the offset by any chance be calculated given the
> latitude/longitude?
>
> Mark
>
>


Have a look at the following sites:

http://www.colorado.edu/geography/g...um/geoid84.html
http://www.colorado.edu/geography/g.../gif/geoid2.gif
http://www.colorado.edu/geography/g...um/datum_f.html

Peter
LinkBot





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