Expedition Navigation Software 
1 of 1- wedersoe
- Admiral
Offline - From: Denmark
- Registered: 3/22/2017
- Posts: 24
C-map 4d Offset of map.
Hallo,
During yesterday's race I notice that they permanent buoys wasn't placed correctly, which was annoying, but after race I realised that the boat position in Expedition C-map differs from the position on the B&G plotter.
Unfortunately, I did not have the tracking line turned on, on the plotter, so I could not chech if we had rounded some fictive buoys doing the race.
But comparing the position on the different maps, it seems that the Expedition C-map position has a slight offset compared to the plotter
Anyone knows why this happens, and how do I fix this?
- ZeeZee
- Admiral
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- Registered: 3/30/2016
- Posts: 321
Re: C-map 4d Offset of map.
Are both devices from the same GPS?
Maybe one of them has a very slow updating GPS and therefore doesn't sow the actual position..
- wedersoe
- Admiral
Offline
- From: Denmark
- Registered: 3/22/2017
- Posts: 24
Re: C-map 4d Offset of map.
Both of them is from the same GPS.
The first thing I did was to compare the GPS coordinates to insure that the format was the same.
There is this offset function in expedition, where it seems like I can move the coordinates, but the only thing that happens is that I move the grid, not the boat nor the actual map.
- •
Thread Starter- wedersoe
- Admiral
Offline
- From: Denmark
- Registered: 3/22/2017
- Posts: 24
Re: C-map 4d Offset of map.
I still haven't found a solution for my problem. An approximately offset of the position is about 18 - 25 meters.
I have a gofree wifi and get all the data from my zeus2 plotter.
Does anyone knows of some settings I have overlooked.
- •
Thread Starter- Nick
- Moderator
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- Registered: 9/16/2015
- Posts: 3,314
Re: C-map 4d Offset of map.
Which sort of C-Maps and where? Denmark?
Which is more correct? What does it look like at the dock?
- wedersoe
- Admiral
Offline
- From: Denmark
- Registered: 3/22/2017
- Posts: 24
Re: C-map 4d Offset of map.
The most precise is the deffently the zues plotter.
I use C-map 4d EN-D299 Denmark and the baltic sea.
- •
Thread Starter- Nick
- Moderator
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- Registered: 9/16/2015
- Posts: 3,314
Re: C-map 4d Offset of map.
Hello,
Can you include a number box with the Exp screen shot?
Can you mail me? It will be far more efficient.
Last edited by Nick (5/04/2017 12:25 pm)
- wedersoe
- Admiral
Offline
- From: Denmark
- Registered: 3/22/2017
- Posts: 24
Re: C-map 4d Offset of map.
Number box ?
what numbers do you need to see?
I won't be on board the boat before tomorrow (24 hours)
I will email you when on board.
- •
Thread Starter- Nick
- Moderator
Offline
- Registered: 9/16/2015
- Posts: 3,314
Re: C-map 4d Offset of map.
It would be interesting to see the position at the same time. I have a BSB chart here too.
- Nick
- Moderator
Offline
- Registered: 9/16/2015
- Posts: 3,314
Re: C-map 4d Offset of map.
For anyone with the same charts, I have mailed C-Map QA.
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