OpenStreetMap

Garmin eTrex Vista handling of tracks

Posted by TomT5454 on 26 December 2012 in English (English)

On Dec. 24 I spent 3-4 hours cruising the warren of little streets nearby with my GPS. For fear of exceeding some server limit on uploaded points, I broke my tracking into three segments. After the first two, I saved the track under a name, then cleared the track log. I saved the third segment but did not clear the log. I found the first two segments failed to upload to OSM for lack of timestamps.

Examining the GPX files, I found my three named track, all three missing timestamps. At the end of the file I found a track named ACTIVE LOG which retained its timestamps. This explains a couple of things, in particular, why I keep getting messages about points not loading due to missing timestamps while the tracks do show up on OSM. Basically saved tracks are redundant to the log, and that is all that needs to be uploaded. Corollary: it should not be cleared until I've captured it as a .gpx file.

The original logs may be available on my data card -- the file with a date-derived name shows up with others there. Trouble is, I don't know how to get at it. The basic Garmin driver doesn't seem to give access to the card as USB storage.

Location: Heron Gate, Ottawa, Ontario, Canada

Comment from aseerel4c26 on 27 December 2012 at 01:15

Hi Tom, I do not think that there is a practical point limit. There are often quite many points at http://www.openstreetmap.org/traces E.g. http://www.openstreetmap.org/user/jairo58/traces/1374143 has 32000 points.

And even if you should encounter some limit - you can edit gpx files with (nearly?) any plain text editor to split the track into smaller parts. Of course, the logical XML structure needs to be kept valid/intact.

There is another issue (well) known: track saving on devices sometimes (depending on the device) results in track simplification to save storage space. At least that is true for older Garmin devices. Only the "active log" is really usable.

For the timestamp problem see e.g. http://help.openstreetmap.org/questions/6827/unable-to-upload-tracks-in-gpx-format/6836

If your device saves its data onto a SD card you could remove it and use a card reader?

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Comment from Vclaw on 27 December 2012 at 02:21

Plug in the Etrex with the USB cable, then go to Main menu > Setup > Interface, and select the option for USB mass storage. Then the memory card will appear as a drive on your PC, so you can copy the GPX files off.

I'm not sure if their is any server limit for uploading GPX tracks. If there is, it is pretty high. It might be quicker if you zip the GPX files before uploading.

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