On Wednesday 23 April 2008 21:27:54 Andy Robinson (blackadder) wrote: > Anne Wilson wrote: > >Sent: 23 April 2008 9:01 PM > > > >To: [email protected] > > > >Subject: Re: [OSM-newbies] Data layer doesn't look like track shape > > > >On Wednesday 23 April 2008 20:10:08 Thomas Wood wrote: > >> > > Track log interval is set (from the main menu - press 'find' twice) > > > >by > > > >> > > picking tracks, then set-up, then 'auto' & 'most often'. > >> > > >> > I can't see that. Set-up offers me time, display, units, interface > > > >and > > > >> > system. None of them refer to interval. > >> > >> Its under Traces and then Setup (It is confusing, I also hadn't found > >> > >> the option there until after owning the unit for a year!) > > > >By Traces, do you mean the screen that shows the shape? The options there > > > >are > > > >orientation, autozoom, hide waypoints and show bearing line. > > > > > > > >The good news, though, is that the manual definitely says 'Update Rate: > > > >1/second, continuous'. > > > >> The USB stuff doesn't apply here, I think the confusion is that you're > >> > >> using a serial to usb device? You should use whatever linux /dev/ that > >> > >> is created when plugged in. > >> > >> gpsbabel expects the unit to be in Garmin data transfer mode. > > > >Which is where I started :-) So, the trace produced by the gpsbabel > > > >command > > > >should download the whole log? > > Anne, just to be clear, according to the manual for your eTrex H > (http://www8.garmin.com/manuals/eTrexH_OwnersManual.pdf) on page 18 it > confirms that you can set the tracklog defaults.
It looks as though I did find it when I first went through. It is set to 00:00:01. So far, so good. > The spec for the unit also > confirms you can store 10,000 trackpoints. I remember checking that before I bought it. > All good. The norm for a > detailed track as has been said before is to set the "Record Interval" to > "Time" and a 1 second interval. Make sure the "wrap log when full" is not > ticked. Yes, that's correct as well. > This means that when the log is full (after just under 3 hours of > mapping) the tracklog will turn off and you will no longer see your trace > continuing on the trace screen. Mostly we download the tracklog after each > trip out mapping and the clear the log back to zero before we go out > mapping again. This keeps the tracklogs clear as to what they cover and > reduces unnecessary duplication. > That is my feeling. I had an empty log when I set out. > > Others hold the view that you can use the devise over a longer period of > time by leaving the device tracklog settings at "auto". This means you can > get a much longer use from the unit before the log is full. The alternative > is to adjust to 2, 3 or 5 sec etc to ensure you the unit will be logging > for the duration you are out. I would recommend you only change back to > "auto" once you can see how the log is working and get the visual feedback > in the OSM editors. > I'm happy to clear each time. > > Note though that converting a 1sec interval tracklog directly to an osm > data layer doesn't really work. Too many nodes and fluctuation. Yes you can > filter the track when its converted to GPX with gpsbabel but that's just an > extra task you shouldn't have to do unless you want to do it that way. Much > easier, especially for areas of the map that already have some data, to use > the tracklog (gpx trace) as a guide to the drawing of ways over the top of > it. > > Hope this helps clarify a few things. > Thanks. It does. However, it doesn't tell me what went wrong when I downloaded with gpsbabel and got very little data. The commands I used were gpsbabel -t -i garmin -f /dev/ttyUSB0 -o gpx -F track1.gpx and gpsbabel -w -i garmin -f /dev/ttyUSB0 -o gpx -F tracl1-waypoints.gpx > > > > In case you need to compare, this gpsbabel command takes the tracklog (-t) > and the waypoints (-w) from the device (I too am using a serial to USB > converter but under windoze) > > > > -w -t -i garmin -f com3: -o gpx -F "path\filename.gpx" > Right. I'll try that one tomorrow, thanks. > Hope this helps narrow down any remaining questions. > Thanks for your patience. Anne
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