I know some insurers specifically won't cover sailboards, like RACV. Sailboards are specifically mentioned in the policy not to be covered as contents. I looked into this last week when I was considering changing from QBE to RACV. The first thing I ever try to work out when looking at house and contents cover is whether my boards are covered. Don't give a stuff if some of my wife's collectable crap gets flogged

QBE exclude from coverage "watercraft exceeding 3 metres in length..." (see the policy document if your mind is sharp but you want it dulled
http://www.qbe.com/australia/western/pdf/Contents%20policy.pdf ). Seems to also cover personal liability if I stack into someone as cover is excluded for liability arising from the use of watercraft exceeding 3 metres, ie coverage not excluded arising from use of watercraft less than 3 metres. Are you still with me????
But I expect most policies wouldn't cover you for "portable items" like sailboards when not at your premises, unless you've bequeathed your firstborn to them. Too high risk. Enjoy the bedtime reading!!