No Waypoints Visible After Importing GPX in OpenCPN

[Roel Smidt]

I really like OpenCPN but somehow I cannot import a GPX-file containing waypoints. Or, to be precise, I can import a GPX-file but no waypoints show up on the OpenCPN screen. The waypoints I use are in the area of the Dutch Frisian Isles (say 53 N / 005 East) and the file contains 1272 buoys. Importing the GPX-file in Oziexplorer works fine but OCPN seems to ignore these waypoints. Maybe this is because the file contains only waypoints and no tracks?
Anybody any idea how to fix that problem?
I have attached the GPX-file (lwwgpx.gpx) to this post......I think....(sorry, I'm not very familiar with the procedures yet).

Hmmmm, it seems I cannot upload a gpx-file. So if someone thinks he/she can help, drop me an email and i'll mail the file.

Roel

[cagney]

Change the file-extension to .doc, for example "some-file.gpx.doc" and you will be able to upload it to this forum.

Without seeing the file, it is impossible to solve your problem.

Thomas

[Roel Smidt]

Thomas, thank you for that suggestion . Here's the file. The original name was lwwgpx.gpx, so it will have to be renamed again before you can use it as a gpx-file.

Roel

[PjotrC]

Roel...

This is because of default visibility for marks in OCPN. If you add to each waypoint

<extensions>
<opencpnrop>A,0,0,0,1</opencpnrop>
</extensions>

you will have them imported as visible.

You could also change the <sym>.

In my series of patches I tweaked a bit the visibility defaults, so your file displayed at once (after some computation time, that is ... ).

Piotr

[dacust]

Originally Posted by PjotrC

Roel...

This is because of default visibility for marks in OCPN. If you add to each waypoint

<extensions>
<opencpnrop>A,0,0,0,1</opencpnrop>
</extensions>

you will have them imported as visible.

You could also change the <sym>.

In my series of patches I tweaked a bit the visibility defaults, so your file displayed at once (after some computation time, that is ... ).

Piotr

Hint of the day:

If you put code tags around code (use the # button), special characters will not get interpreted as emoticons:

Example:

You have:

<extensions>
<opencpnrop>A,0,0,0,1</opencpnrop>
</extensions>

But, if you used the code tags, you would get:

<extensions>
<opencpn:prop>A,0,0,0,1</opencpn:prop>
</extensions>

-dan

[idpnd]

Nice, GPX never really worked for me either, can't wait to try the patches..

[cagney]

Roel Smidt

I have converted your Ozi file so it is visible in OpenCPN.
The original file has a comment tag, were every wpt has a description, this is lost in OpenCPN as there is no field to display it. In OCPN you can chose which symbol to display for each wpt, you can even use custom symbols if you like.
There are no such tag in the original file, so OCPN is left to display the default - a circle. This can easily be changed to another symbol in the script below.

To do this conversion I used this ruby script

#!/usr/bin/ruby -w

infile = ARGV[0]


 open("ozcpn.gpx","w") do |p| 
  lines= open(infile,"r") 
  lines.each do |line|  
   if line =~ /\<desc\>/
     p.puts line
#uncomment the line below to get triangles instead of circles
#   p.puts "<sym>triangle</sym>"
     p.puts  "<extensions>"
     p.puts  "     <opencpn:prop>A,0,1,1,1</opencpn:prop>"
     p.puts  "</extensions>"
   else
     p.puts line
   end
 end
  end

To convert use this script with the original gpx file as an argument. This will produce the file ozcpn.gpx.
Feel free to customize the script !

It's interesting to see how this amount of wpt:s really slows OCPN down. On my old box it takes about 25 seconds to load all way points. Maybe not a fair test, as there are a lot of fields that OCPN don't know what to do with.

Thomas

[Roel Smidt]

Thomas, Piotr and Dan,

Thank you very much for your input and efforts to help me out. This was just the kind of help I needed.

It probably would have taken me months to figure it out by myself (if not years..)

Regards,

Roel

[martin.gale]

I have the same problem, i tried to change my ozi waypoint files but i cannot see them if i import the file (martingale.gfx)

If i import the example tsr2009ex.gfx i see the track.
if i change in the file "trk" by "wpt", i see always the track and only the track
I would like to see circles or triangles and names on the map

[cagney]

martin.gale

I would like to see circles or triangles and names on the map

That is exactly what I see when I import your file !!!

Thomas

[martin.gale]

I don't see anything !!!!!

Vista, Compaq CQ71, CM93 charts and BSB Charts

[martin.gale]

Thomas, I forgot to thank you for trying my file
I join the map i see on my computer, the visible waypoints have been created manually, but i cannot see the others !!!

[martin.gale]

However all the waypoints are in Opencpn , when i export them from with gfx output, i well obtain a perfect gpx file !

[Roel Smidt]

Hello Martin,

I have tried your file in OziExplorer and in OpenCPN and I can see quite a number of waypoints. You are saying that there are some waypoints not visible for you. But I don't know wich waypoints you mean. Can you give a name of a specific waypoint that does show up in OziExplorer but does not show up in OpenCPN?

Kind regards,
Roel

[cagney]

martin.gale

Please export your "handmade" wpts that are visible, and publish the gpx file here.
Anyone else on Win, that can test Martins gpx file ??
I'm on Linux...... and it just works.

Thomas