How much work
is involved in adding the new version? I am using transits for adjusting magnetic compasses where I need an accuracy of 0.5 degrees. 0.3 degrees does make a difference for this application.
Ok, I modified the output of OpenCPN
to show a bearing accuracy of 0.1 degrees for routes and the measuring tool.
Two versions? But if it is a lot of work
I can use the NOAA online calculator for the limited number of locations I work from.