It’s very easy to find the F/V SUNRISE (F/V stands for Fishing Vessel). If you are good with maps, there is one below.
The most important things is to just get yourself to the town of Northeast Harbor. Once there, the marina is very easy to find- there are signs everywhere pointing the way and the whole town is basically just one short street.
If you would like to use the free Island Explorer bus system, visit their website here: Island Explorer Bus System for schedules and routes. Bus #5 aka The “Jordan Pond” bus drops passengers off right at the dock where Sunrise departs.