charged off secured debt, now what happens?

i have a secured loan, the security is a boat. it is now in default and the bank has actually charged off the amount as bad debt. now that it is charged off, what can i expect? the boat is no longer worth anywhere near the outstanding loan balance. i've tried to sell the boat but the bank won't consider a short sale, i offered the bank several payment options but they won't even respond to my letters. i did letters because i wanted a paper trail. i even offered a voluntary reposession and this was turned down. they don't want the boat any more than i do. how can i address this and get this albatross from around my neck?