A little late replying.. We just checked in at Cruz bay … directed to fill in the Roam details at a kiosk. Of course no DTOPS number ss not my boat. The customs agent said … just fill in NONE1.
I asked if this would work if doing it remotely … ? The answer was Yes. So no DTOPS number needed … at least for USVI.
The NPS dock and building is being renovated .. so you have to leave your dinghy either side of the ferry terminal.