I just cleared into Antigua
using the eSeaClear system and recall
how much easier it is than the old paper method. They had 4 different forms, all asking the same questions in different order and on different size paper. It would be a lot of writing and checking registration
dates and passport numbers. Using the eSeaClear took just a couple of mouse clicks and the 6 forms were filled in and being printed in the back of the customs room and all I needed to do was sign them all and proceed to immigration. Unfortunately the system hasn't been adopted anywhere else.
The French islands use a common software
system to enter clearances; the difficulty here is that they use the French AZERTY keyboard which makes it tough to find some of the letters and symbols. St. Barths uses the same system but they actually store boat and crew information so it doesn't need to be re-entered each time; but they are the only ones to have this system.
While Sailclear purports to be used in the BVI, the authorities there have never heard of it. Their web page uses a terms like "will be implemented..." so I'd not put much faith in their list of countries supported. I'm off to Dominica
next, and will ask about it when I clear in there.