I went to a nearby dock and there are no boats anywhere. I was able to find one small boat with a stick to propel it but that’s not gonna get me across the sea to take on all the enemies. Where are my Viking friends?
You should be able to call for a longboat on demand. It’s not something I ever used much as I was always able to find boats or just fast travel.
If you make your way to the coast, you can hold down on the d pad and the option on the left should allow you to call a longboat to raid the abbey.