Originally Posted by xytxyt
Hi, I have some S57 charts
with different scaling for example one of them is 1:30000, one is 1:80000. When I zoom out to certain level, the one with maximum scaling 1:30000 disappear, only 1:80000 still remains there. Is there any way to set it up in the Options menu or I should change some the OpenCPN code?
You probably want to make sure your real physical display size is set correctly and play with the Chart Scale / Zoom Weighting factor in Toolbox -> Display -> Advanced to suit your liking
Remember that S57 charts define what is shown at which scale and their producers probably had a reason to do it the way they did.
By the way, is there a manual that describes all the methods and structure of the OpenCPN code?
No, you have to read the code.