San Francisco Bar Pilotage: Dispatch Through Fog and the Golden Gate

San Francisco is a district of contrasts for a dispatch desk: a pilot boarding ground well offshore at the San Francisco Bar, then a transit through the Golden Gate into one of the West Coast's busier bays, fanning out to Oakland's container terminals, Richmond's refineries, and up the rivers toward Stockton and Sacramento. Add the fog the region is famous for and the strong currents through the Gate, and you have a district where timing the pilot to the ship is the whole job.

What makes the district demanding

The offshore boarding ground. San Francisco pilots board at the Bar, a substantial run from the pilot station. Getting the pilot boat there to meet an inbound ship — not too early, not too late — depends on a reliable ETA computed from the vessel's position far out on the approach, where the dispatcher needs to be watching well before the ship is anywhere near the Gate.

Fog. The summer fog that pours through the Gate is not a postcard to a dispatcher; it is a visibility and timing problem. When the bar and the approaches go thick, the value of a precise AIS picture and a current-aware ETA goes up, because the eyeball picture is gone.

Current through the Gate. The tidal flow through the Golden Gate runs hard. A speed-over-ground ETA that ignores it misreads when a ship reaches the Gate and the bay — exactly the kind of error that matters when you are timing a boat to an offshore boarding ground. (See tidal windows and slack water.)

A busy, multi-destination bay. Once inside, ships fan out to Oakland, Richmond, the city front, and the rivers. The dispatch picture is a bay with several destinations and constant cross-traffic, not a single boarding ground.

What a board has to do here

• Watch the offshore approach early, with a current-aware ETA to the Bar boarding ground so the pilot boat launches on real data, not a guess.
• Keep a clean AIS picture when the fog closes in, surfacing inbound vessels and their timing when the visual picture is gone.
• Run [CPA/TCPA](/blog/cpa-tcpa-explained) across the bay's traffic, flagging the close-quarters situations that develop in a busy, multi-destination waterway.
• Carry the transit from the Bar to the berth as one record, feeding the duty clock and billing.

How Binnacle Passage approaches it

Binnacle Passage ingests the district's live AIS by coverage zone, computes a current-aware ETA to the boarding ground using NOAA current for the Gate, and keeps the inbound picture legible when visibility fails. CPA/TCPA runs across all contacts with a close-quarters alert, and each transit is one record from the offshore boarding to the berth. For the move off a radio-and-paper desk, see Binnacle Passage vs the VHF + paper board.

The bottom line

San Francisco's dispatch challenge is timing a pilot to an offshore boarding ground, through fog and a hard tidal current, into a busy multi-destination bay. That puts a premium on a reliable AIS picture and a current-aware ETA — precisely where a tide-blind, radio-only desk is weakest. For the wider context on US districts, see where state pilotage is required.

This article is general information. San Francisco Bay pilotage is governed by California state law and the licensed pilots serving the district.