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ONBOARD CARD 03 — Pre-Gulf Stream Approach

Phase: Final 50–100 nm before Gulf Stream north wall entry. Typical elapsed time: Race start +20–35 h depending on conditions.

Arrive at the Stream entry latitude with the correct sail set, a confirmed current position, and the crew briefed and rested.

TL;DR

  • 50-nm window = last chance for a calm sail change. Set the Stream-entry sail NOW.
  • Brief ALL crew on the Gulf Stream — wake everyone if necessary.
  • Pre-assign every crossing role before the north wall. Write it down.
  • Everyone eats, hydrates, takes anti-nausea med 1–2 h before entry.
  • Run the Navigator 50-nm checklist (SST + models + GPS/log + CAPE + ETA + brief).
  • Review the squall callout sequence before crossing the wall. Canonical 30/20/10 ladder applies.

DATA TO CHECK

At 100 nm from planned crossing latitude: - GPS/log current vector: shelf edge current helping or hurting? - Wind: gradient matching forecast for the crossing window? - Pre-loaded SST overlay: north wall where expected?

At 50 nm from planned crossing latitude: - Confirm entry latitude plan: still the right call based on current Stream position? - Confirm crossing wind forecast: what will wind be doing when you hit the wall? - CAPE check (if GRIB loaded with convective indices): squall risk in the corridor? - Crew status: who is rested? Plan strongest watch for the crossing.

Run all of the following before crossing the 50-nm threshold:

  • [ ] Pull latest SST overlay (Windy SST, PredictWind SST, or NOAA GOES): confirm north wall latitude at your crossing longitude — has it moved since pre-race brief?
  • [ ] Pull latest model wind for crossing window: ECMWF and GFS; verify agreement within 5 kts; note any forecast convection in the Stream corridor
  • [ ] Confirm GPS/log SOG vs COG delta: measure actual current set to validate Stream north boundary estimate
  • [ ] Check for Loop Current eddy positions: warm-core eddies can add 1–2 kts favorable set; cold-core eddies subtract
  • [ ] Review SST at planned exit latitude (south wall): confirm exit into Sargasso is clear of unexpected eddies
  • [ ] Calculate ETA at Stream north wall: brief Skipper on timing (day or night crossing?)
  • [ ] Log current Stream crossing plan: entry latitude, exit latitude, wind forecast for crossing, expected sea state, contingencies
  • [ ] Brief Skipper and Watch Captains before entry

TRIM / SAIL

  • Reef #1 pre-rigged in mast before entering — keep it there throughout the crossing
  • Choose the Stream-entry sail and set it before crossing; avoid arriving mid-peel
  • J1/J2/J3 = forestay-track; changing requires a foredeck peel. If you might need J3 inside the Stream, transition to it now.
  • J4 = own furler (own halyard, 3-to-1 tack) — unfurl/furl, no peel. Option for heavy Stream conditions.
  • Code 67 = furls on sprit; faster deploy/recover than a headsail peel.

CREW PREPARATION

Sleep before Stream entry: Begin managing sleep rotation at 100 nm out. Protect rest for the crew who will be needed for the crossing. Do not let them stay up watching a routine offshore sail plan.

Crossing watch: Confirm before the 50-nm threshold. Put the most experienced helm in chop and the most experienced main/kite trimmer on. Assign a backup to every role.

Harnesses: On and accessible before crossing the north wall. Tethers clipped to jacklines on deck.