Lets see if I can do this without calling you an idiot...
ZoneA - Invis NPC with with a tight timer loop(say 5 seconds), every time the timer fires it checks the value of a global variable.
ZoneB - Boat hits waypoint and changes the value of the global that is being checked by the invis NPC in ZoneA.
When the invis NPC in ZoneA notices the global has changed value, it spawns a boat, assigns it to the grid and resets the value of the global.
Its pretty basic stuff.
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