Did you have 5 persons onboard? I'm guessing the $50 is for the BVI Environmental & Levy fee of $10 per-person charged to all private vessels and USVI charter vessels entering BVI and to BVI charter boats.
There were only 4 of us. Hard to know for sure if I was charged the correct amount - it's not like you can have a discussion and/or question the C&I folks. You just have to smile, be polite, and accept whatever number they come up with that day.
