Hi, Search the word insurance in this forum to get some info from others with similar issues.
I guess that Pantaenius have had a few too many claims related to Jurian Bay and have made the decision to stay away.
Boat insurance above the 26th parallel is hard to get now. Speaking from experience, it is also very expensive compared to the southern states, and generally comes with high accesses and restrictive conditions. The only other insurer I am aware of that covers that northern area is QBE.
Good luck, Ross