I experience a problem with using the mouse to control the zoom. It is very sensitive and hard to control. The scale jumps appear very large. I have looked but cannot find a pref or other setting.
OpenCPN 4.8.2
Bitmap charts
Apple Wireless Mouse and wired mouse
Up to date Retina Laptop
Thanks again for all the help. It is still difficult to control with the Apple Wireless Mouse - but less so with a wheel mouse. Makes it very difficult at the chart table in a lop. I guess time and attention will sort this out.