CM 93 slightly offset? How to correct?

[Franziska]

Hi,

I recently noticed that our CM93 chart set which we use as base layer, seems to be slightly miss positioned.
I noticed that when looking at a marina.

On the MBtile chartset all AIS targets where properly docked. When I switched to CM93 they where about 100m off the dock.
The marina was clearly visible in both chart sets.

Is there an easy way to fix this?

[Franziska]

I did find the feature of CM correction when quilting is off.
Still this corrects only a very small area.
I lost a lot of thrust into our CM 93 base layer as I feel I can never be sure if it's correct.
The MBtile drawn with SASplanet seem better aligned on average.

[rooiedirk]

As you noticed you can only correct cm93 with quilting off. Then there is only one cell visible and corrections made are only for this single cell.


Btw, a 100m is nothing, we found on the east coast Canada offsets upto 2.5nM