just noticed a crash when returning from a mission and then going to request a new mission (campaign). I found the cause of it and I'll have to release a new version to fix it. So I'll be releasing v5.7.1 here soon.
Here are some of the other things I have noticed and fixed also:
v5.7.1 - fixed bug of navigation fixes not cleared (reset) at game end
- fixed bug of navigation fixes visible on navigation map while receiving new mission orders
- fixed possible game hang when setting new navigation fix close to actual boat's position
- fixed game crash that happens when in campaign and you do a mission then return to base and request a new mission
These navigation fixes are kicking my butt. Price to pay for adding something entirely new to the game

But once these are sorted out adding the super marks will be a breeze.
Patch 1 released for v5.7.0. See post #1 for details.