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Old 19-10-2018, 23:32   #1
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Join Date: Oct 2018
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OpenCPN and OSM raster charts

Hello all.

I'm trying to use OpenCPN with OSM raster charts (I just wanted to test it on Mediterranean and OSM was the only source for that region I was able to find). I encountered strange behavior which I can't explain. Either it's chart data bug or OpenCPN bug.

I downloaded charts here: https://wiki.openstreetmap.org/wiki/...rom_OpenSeaMap, put it into a directory and rebuilt charts DB with OpenCPN.

When I start OpenCPN I see this:
https://imgur.com/a/1ZDakGX

Zoom in several times and I see this:
https://imgur.com/a/UkDq4ID
Corsica and Sardinia outlines can clearly be seen now (I don't understand why the chart isn't shown, but that's not a problem I'm talking about atm).

Zoom in a little more:
https://imgur.com/a/6lRKGaJ
We're still around Sardinia.

Zoom in once more:
https://imgur.com/a/t8bLT40
BOOM! We're in Milano now! That happens with every OSM chart I tried - small zoom levels show totally wrong chart, but if you zoom in more, higher zoom levels will get you to the correct place, so if I continue zooming here I eventually see Sardinia again, but in more details, of course.

I built OpenCPN from the latest Git and tried available OpenCPN builds for OpenSuSe, but the problem persists.

What am I doing wrong? Or is this some OSM charts bug?
tony2001 is offline   Reply With Quote
Old 20-10-2018, 04:40   #2
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Join Date: Feb 2010
Location: Tierra del Fuego
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Posts: 5,589
Re: OpenCPN and OSM raster charts

To start with

- Check the "Preserve scale when switching charts" checkbox on Display->General tab in the toolbox
- Stop wasting your time with these OSM "charts" and especially as a new user play with some real, correctly produced, free charts available, for example the US ones.

If the behaviour you observe persists, let us know.
nohal is offline   Reply With Quote
Old 21-10-2018, 02:21   #3
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Location: France/UK
Boat: Gib'Sea 402
Posts: 494
Re: OpenCPN and OSM raster charts

I have OSM charts for France on my laptop and have no problem displaying them on OpenCPN with Windows 10. I have them to show more detail of land and coastal features.

They are, of course, completely useless for plotting at sea ... ...
hoolie is online now   Reply With Quote
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