These boats can fill up. The capacity of a boat is equal to the combined sum of all your Resource Bases of that Resource type's collectors' capacity. Basically, if one of your Resource Bases' collector fills up, you will have to collect from the boat for that base's collector to start producing again. This means that overall Resource Base production slows down after a few hours (because the lower-level Resource Bases fill up with Resources) and stops eventually.
Players attacking your home base cannot steal anything from these boats, but if one of your Resource Bases is taken over, you will lose any uncollected Resources from that Resource Base.
"Thank you for driving away the invaders. We will return the favor." - When the player destroys Enemy Base (the first Blackguard Base)
"Thank you for saving us! Those men imprisoned us and took our holy idols." - When the player defeats a Blackguard Base for the second time
"Thank you for freeing us! They made us work for days without food or rest." - When the player defeats a Blackguard Base for the third time
"The men that you defeated call themselves the BLACKGUARD. Why are they attacking us? Why do they smash our old statues?" - When the player defeats a Blackguard Base for the fifth time
"This used to be a shrine built by our ancestors, full of ancient statues. I believe the statues hold great power. The BLACKGUARD wants them all!" - When the player defeats a Blackguard Base for the sixth time
"Our ancestors were buried with Life Statues to help them in the afterlife. The Blackguard is robbing their graves, and taking the statues with them!" - When the player defeats a Blackguard Base for the seventh time
The male Native Islander was not added until the global release of Boom Beach. The male Islander can be seen jumping out of a destroyed Headquarters. They look very similar to Warriors.