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Board » Technical Support » Map alignment

Posted by
Lolla


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32
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2011-11-03 01:28:52
2012-02-18 14:21:29 - Map alignment
Hi all,

I'm testing a new beta release of Expedtion and I noticed a mis-alignment of the base c-map based on the position from Brainaids NMEA feed. My position is the same in both SOL and in Brainaid so I guess it's Expedition... just wondering if anyone else have notice anything like this?
Posted by
AGage


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2008-12-27 10:31:57
2012-02-24 07:07:03 - Re: Map alignment
There are 2 different data sets being used to create the maps. SOL uses the GSHHS data, which does have some differences from the C-Map data used in Expedition.

Also, SOL does not use the highest possible resolution available in the GSHHS dataset over the entire globe. C-Map's themselves will differ depending on when they were published.

It really makes little difference to your using Expedition though - as you need to create your own mask to avoid routing over certain sections (like land), you can adjust when neccessary. Although usually the difference is so small that you can just adjust your course in SOL instead of the land mask you set in Expedition...

HTH
I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__
Posted by
Lolla


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32
Registered at
2011-11-03 01:28:52
2012-02-24 08:59:42 - Re: Map alignment
Many thanks Aaron.

Yes, I ended up putting exclusion zones around the whole Lake Winnebago :)

The difference was just in Exp beta 8.3.12.11 though. It was fine (or normal) in release 8.3.11)... and now also fine in beta 8.3.12.15 so I guess it was a small alignment glitch in the beta.

Br, Jorgen

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