My boat came with a full cover made in 3 sections, covers the boat completely.
1. Shields UV (for the winter months anyway, small but every little bit counts when you have exterior teak
2. Keeps things dry so that annoying green junk that likes to grow on everything as soon as the days grow short is held at bay.
3. Because it's dry and covered I can leave the hatches open for ventilation and get no mold
or mildew all winter.
4. Allows some of the exerior maintinence, and other projects to be done in the winter months. Last winter I repowered with a new diesel
and was ready to rock come spring.
1. Makes the boat dark as a pocket, but I can roll up the sides of my cover to let more light in when we are there.
2. If you do decide to go for a winter cruise
there is an added 40 minutes to remove the cover, and the same to put it back on.
3. One more item to keep maintained.
I had another boat in the past that didn't have a cover, and this one that does, and I much prefer to have a cover. It's a little melancholy puting the cover on for the winter, (just did that today) but it does make life much easier.