If you were on a zero to 1 year old boat and they are putting you on a older 4500 I would definitely ask for the credit.
WHY Credit which locks you into the company for another trip? (Do you really want to repeat with Moorings after this management issue? If answer is "yes" , then credit okay... If ""maybe" or "No", then credit is bad deal).
You should get a refund.... 3750 that they offer is not equal to the difference in older 4500 model and a newer 5000. I would ask for $5000 cash refund.
If you settle for a "Credit" , demand that the credit is transferrable to other individual.
