If you are lucky enough to have bought a new watercraft then very quickly you are going to have to sort out some kind of insurance so that the boat is covered in the event of theft, an accident or a hijacking.
When you look into the matter you will find that the difference between "Boat Insurance" and "Yawl Insurance" principally comes down to the length of the boat. Boats are normally thought of as being watercraft that are smaller than twenty-six feet in length, whilst Yachts are thought of as watercraft that are 27 feet and longer.
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The other differences between the two come down to the types of use that the two types of craft are likely to get. Because boats are smaller it is generally considered that the range of their activities will be smaller and that they will be traveling smaller distances.
Of course, this is a generalization, and so if you have a craft that is less than 26 feet in length, but which perhaps you use on different types of waterways (or at least more than the norm). Then you should be certain to read the small print of your boat insurance policy before traveling anywhere, or going anywhere that is potentially unsafe.
Because Yachts tend to travel longer distances (as they are larger boats) it is more common to have wider sea cover included, and also to include such elements as hijacking cover, etc if you ask for them, though naturally, you will pay extra for this.
As with any kind of insurance, regardless of whether you end up needing boat insurance OR yacht insurance you should be sure to seek out a wide variety of quotes and read the policy documents very carefully so that you end up with the cover that fits your particular requirements