Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 19-10-2018, 23:32   #1
Registered User

Join Date: Oct 2018
Posts: 1
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
Registered User

Join Date: Feb 2010
Location: Tierra del Fuego
Boat: Phantom 19
Posts: 6,198
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 online now   Reply With Quote
Old 21-10-2018, 02:21   #3
Registered User

Join Date: Jan 2011
Location: France/UK
Boat: Gib'Sea 402
Posts: 546
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
Reply

Tags
charts, enc, opencpn

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Raster Charts BSB3 Sweden and Finland Gilletarom OpenCPN 60 10-03-2018 00:50
OpenCpn not displaying raster VMH charts markdj OpenCPN 2 05-05-2016 01:04
Raster Charts of Belize and Mexico Mhorowitz Navigation 3 19-09-2015 18:14
Source for BA and French raster charts? sneuman Navigation 1 24-08-2015 02:09
Raster Charts or Vector Charts - Which is Best for Electronic Navigation ? Alecadi Navigation 19 28-03-2012 19:56

Advertise Here


All times are GMT -7. The time now is 08:01.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.