Forgive the newbie question. After eight sailing trips to the BVI we're considering venturing over to St. John's for a night or two (in December 2021). I've been reading that clearing customs into the USVI can be done with an app on your phone. Can that be done anywhere as long as you have a signal? Or do you still need to enter a port with a C&I office? Thank you. (Been off Travel-Talk for over a year - amazed at the wealth of information provided by you fine folks.)