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ONBOARD CARD 04 - Gulf Stream Entry

Phase: Approaching and entering the Gulf Stream north wall Typical elapsed time: Race start +24–40h depending on conditions Location: Approximately 36.5°N to 38.5°N (varies by year and route)

UNFAMILIAR BOAT NOTES - READ THIS FIRST

This crew is racing Lupo Di Mare together for the first time. The following protocols are adjusted for that reality.

1. Set your sail BEFORE entering the Stream. No sail changes inside. You will not know your way around this boat well enough to execute a clean peel in the Gulf Stream at night in building chop. Decide on your entry sail while you are still south of the gradient with time to make the change in controlled conditions. Once you cross the SST gradient, that sail stays up until you exit the other side, barring an emergency. An emergency is "the boat is in danger." Being 0.2 kts slower than polar is not an emergency.

2. Know where every line is before you need it. Before the Stream entry window, every crew member on watch must physically locate: the reef line, the kite sheets, the kite halyard, the tack line, the foreguy, and the runner (if fitted). Do this in daylight. At 3am inside the Stream, reaching for a line you've never touched is how accidents happen.

3. The first time you do a maneuver offshore at night is not the right time. Every maneuver in this card - kite douse, reef, headsail peel - must have been practiced in daylight before the race. If it was not drilled in race week, do not attempt it for the first time inside the Stream. Accept the speed loss. Sail the conservative option.

4. Squall protocol must be drilled, not improvised. If the squall drill was not completed in race week, use this threshold: at ANY radar echo within 30 nm to the W–SW–NW while approaching or inside the Stream, the kite comes down immediately, reef #1 goes in, and all crew clips in with tethers. No discussion. This is the default for a crew that has not drilled together.

5. If you are uncertain about the maneuver, take the conservative sail and accept the speed loss. A blown A2-1 inside the Gulf Stream means a fouled halyard, a crew at the bow in chop at night, and a boat potentially hove-to for 20–30 minutes. That costs far more than dropping to the A3 or J3 30 minutes early.

PRIMARY OBJECTIVE

Enter the Gulf Stream at the planned latitude with the correct sail, a confirmed read on the current direction and speed, and no active squall threat within 30 nm.

DATA TO CHECK

Before entry (while SST gradient is still >50 nm north): - Latest RTOFS/HYCOM surface current at entry latitude - note direction and magnitude - GRIB forecast wind during crossing window - CAPE overlay if available - any convective risk in the crossing zone? - SST isotherm position from most recent imagery (pre-loaded - not live data unless NOR permits) - Radar: any echoes within 30 nm to the W–SW–NW? - Log of boat speed and current set: are you already seeing Stream influence (faster or slower than expected)?

At the SST gradient (water temperature change): - Sea surface temperature: note temperature every 30 minutes - Boat speed: increase at entry is typical (2–5% of polars) - Current experienced: GPS speed minus boat log = current speed and direction - Note change in wave character: chop increases if wind is opposing current

TRIM / SAIL IMPLICATIONS

Before entry: - If any squall or CAPE risk: reduce to most appropriate reaching or upwind sail - DO NOT enter the Stream mid-peel - If you are mid-code-zero and see a squall echo developing: douse now, reassess afterward

Inside the entry: | Conditions | Preferred sail | Notes | |------------|---------------|-------| | SW 10–16 kts, reaching | A2-1 or Code 65 | Code 65 if TWA 60–75°; A2-1 if 80°+ | | SW 16–24 kts, reaching | A2-1 or J3 | A2-1 if chop is manageable; J3 if gear-shy | | SW 24+ kts, any angle | J3 or J4 | J4 at 28+ kts; reef ready | | NW 10–20 kts, broad reach | A2-1 or A3 | A3 if angle opens past 120° | | NW 20–30 kts, running | A3 or SS | SS only if crew is confident and conditions are manageable | | Light <8 kts | A1-1 or Code 65 | Code 65 if tight angle; A1-1 if open reach | | Upwind in adverse current + chop | J3 or J4 - conservative | Do not try to carry J1 in Stream chop upwind |

TACTICAL OPTIONS

  1. Enter on the planned latitude - execute the pre-race routing hypothesis
  2. Enter early (north) - if current on rhumb is adverse and a CCR western limb is within reach
  3. Enter late (south) - if Stream has shifted significantly north and current at planned entry is weak
  4. Hold at gradient - if squall line or front passage is imminent (30 min or less) - do NOT enter the Stream in that window

RED FLAGS

  • Radar echo within 30 nm to W–NW: GET KITE DOWN. REEF #1 READY.
  • Water temperature change >5°F in <2 nm: you are in the north wall - full crew awareness
  • GPS-over-log current showing adverse >1.5 kts: you may be in a meander - check position vs pre-race Stream analysis
  • Wave height and period abruptly change (steeper, shorter): wind-against-current condition - assess sail choice immediately
  • Log boat speed drops >1 kt unexpectedly: adverse current - are you in the wrong lane?

DECISION THRESHOLD

If experiencing >2.5 kts adverse current on rhumb and this was NOT forecast: - Calculate: is it faster to bash through or deflect 15–20°? - Routing software decision (pre-loaded or onboard): run the detour scenario - If detour saves >2h on corrected time, seriously consider it - this is the classic "acknowledge the adverse Stream" decision

If squall threat forces a delay at the north wall: - You can hold position for up to 60–90 minutes south of the wall; this costs you less than a blown kite inside the Stream - Brief the crew: "we are waiting for the squall to clear"

WHO GETS WOKEN UP

  • Everyone on deck when SST change of >4°F in 5 nm observed - Stream entry is imminent
  • Navigator: any current reading showing >1.5 kts different from forecast
  • Owner/skipper: if squall is forcing a tactical hold or route change from primary strategy

PRE-RACE RESEARCH - NOT race-period routing advice