Just in case you do not, I mean one of those lightboats. The kind that gets anchored in dangerouss areas that have no place to plant a regular lighthouse.
Portable lighthouses have mobility.
I can imagine your incredulity if I assured you that as soon as they see a storm coming up, they quickly move that portable lighthouse out of danger. Because we understand the function and purpose of any lighthouse. Of course the caretakers of this special vessel will do all they can to make sure it will stay afloat and lit no matter what. They certainly will not leave their portable lighthouse to its own devices. Jesus seems to have a similar concern in our current memory selection.