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Miami Beach to Brickell by boat: twelve minutes, not fifty
Between Sunset Harbour and the mouth of the Miami River there are a little over four nautical miles of flat, protected water. By road, at the wrong hour, the same trip is one of the worst in the county.
Why the road loses
Miami Beach and the mainland are joined by a handful of causeways, and every one of them funnels the whole island onto two or three lanes. MacArthur, Venetian and Julia Tuttle all feed the same downtown grid at the same hour. A trip that takes fifteen minutes at eleven in the morning takes three times that at six in the evening, and there is no alternative route because the alternative is water.
The bay itself is the shortest line. From Sunset Harbour to the Miami River entrance is about four and a half nautical miles in a straight line, almost all of it inside a protected bay with no swell and a posted speed limit only near the channels and the manatee zones. A tender that cruises at twenty-five knots covers it in around twelve minutes, plus the time to board and to tie up.
What the crossing looks like
You give two docks and an hour. Captains who are already on that water answer with their boat and their price. You pick one, a four-digit boarding code appears, and you watch the boat come to you on the map. You hand over the code on the pontoon, the trip starts, and your card is charged when you arrive rather than when you book.
Luggage is the detail people forget. A cabin bag each is never a problem; four large suitcases and a pushchair is a different boat. Say how much you are carrying when you ask, so the captain can answer honestly instead of discovering it at the dock.
What it costs, and why there is no fixed fare
There is no published price for this crossing, and that is on purpose. The captain who answers sets the amount, based on their boat, the hour, the fuel and how full their day already is. You see the complete figure before you confirm and it does not move afterwards.
What we can say is what drives it: distance, the size of the boat, whether it is a peak hour, and whether the captain has to reposition empty to reach you. A short hop inside the bay on a mid-size tender sits far below a day charter; a crossing at seven on a Friday evening costs more than the same crossing at eleven on a Tuesday.
When the boat is the wrong answer
Three cases. A small craft warning, when the captain will cancel and should: a cancellation for weather costs you nothing on either side. A very early or very late hour, when few captains are on the water and nobody may answer. And a dock that is nowhere near where you actually need to be, which turns a twelve-minute crossing into a twelve-minute crossing plus twenty minutes of road.
That last one is worth checking before you book. The bay is fast; the last mile on land is not.
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