I've just started using
Open CPN on a Mac with OS
Catalina version 10.15.7. There was no problem with creating waypoints and routes between San Pedro Harbor and
Catalina Island, but I ended up with inconsistencies between what was listed on my
route printout for courses between waypoints and what was described when placing the cursor over the legs on the digital chart.
Also, when checking leg courses between the digital chart and Paper chart,
(Maptech #129, Los Angeles & Santa Monica Bay), I found major inconsistencies on course directions. I thought perhaps I wasn't calculating magnetic variations accurately, but found that "True" courses were different as well. Even a plotted position ended up being slightly different on the digital chart compared to the paper position - .4'.
Any suggestions?
Much Appreciated,
Twisted Kilt 2