Large commercial vessels cannot maneuver easily and need over a mile to stop. Never cross in front of a ship. Stay out of the main channel and monitor VHF Ch. 16 for traffic advisories.

Wind accelerates through the Golden Gate — often 20–35 knots by early afternoon. Mornings are calmer. If you're newer to the bay, plan your return before 2–3pm and check the marine forecast.

SF Bay averages 52–58°F year-round. Cold shock and swim failure are serious risks. Wear a PFD at all times. Hypothermia can impair judgment within 30 minutes. File a float plan before every trip.

SF fog can reduce visibility to under 100 feet with little warning. Know your sound signals — one prolonged blast every 2 minutes under power. Slow down, post a lookout, and never assume others see you.

Bay tidal currents can exceed 4 knots through the Gate and create steep chop when opposing wind. Current tables differ from tide tables — check both at tidesandcurrents.noaa.gov before departure.

Coast Guard requires: PFDs for all aboard, flares, VHF radio, fire extinguisher, and sound signaling device. Also bring: anchor, first aid kit, extra water, and a charged phone in a waterproof case.