Some folks have touched on it, but not quite......
The trailing boat employs a General Dynamics GS498 gyroscopically stabilized high definition camera
at the top of the mast
. They only weigh 290 grams so there is no weight aloft issue.
The hi-def camera
can track the leading boat's mast
through a sophisticated tracking algorhythm develpoed by NASA to track space launch cameras; once locked on, it will not lose it..... even if it does momentarily lose sight, the software
employs dead reckoning probability algorithms to re-acquire rapidly.
With the GS498 high in the mast on the chase boat, the lead boat is in constant observation, albeit only their mast, yet without an eagle-eye-in-the-sky, the lead boat lacks the ability to observe the interloper behind.
Before the nay-sayers jump in about nightfall, EVERYONE knows the GS498 also has an infrared function, scheesch!