I think it will depend on who you insure with, and it pays to shop around
When I first got my two kayaks I spoke to CGU who informed me that I would need to take out a Marine Insurance Policy (same as a stink boat) :shock: to get cover as they were not covered in my home and contents policy (and were also not covered with Personal Effects Cover).
I then spoke to NRMA, with whom we now have Blue Ribbon Home & Contents Insurance, who said I could have the kayaks insured anywhere in Australia as part of their optional Personal Effects Cover, as they fell under the classification of Sporting Goods. Because of the combined value all I had to do was specify them on the policy along with their respective values (inc accessories) and they would be covered against accidental damage/fire/theft, etc.
We found this method of insurance much cheaper than the stand alone Marine Insurance Policy.
We travel alot with the kayaks on the back of our Camper Trailer, so it was pretty important to me to have them covered as they are often left unattended near our campsite, or beside the trailer overnight.
I still lock them up using a SnakeLoc and remove my electronics whenever I am going away for any length of time, but I dont really worry about leaving them unattended anymore