Bingo.. Prize goes to Wayne.
I actually have three covers for my boat.
The winter Navigloo structure and heavy tarp that does a good job for the elongated late fall/winter/spring season.
The stem to stern travel/mooring additional accessory cover that uses some of the factory installed snaps and expects you to install half a dozen more both sides on the gunnels.
Lastly the stand up foul weather "canvas" meant to extend your boating season up here.
This cover and it's 4 extra panels are why a couple dozen male snaps are attached to the boat..along the gunnels, around the curved walk through wind shield, on the stern, etc.etc.