Arriving at Night — New Anchorage
Safely approach and anchor in an unfamiliar anchorage after dark — preparation, pilotage, hazard spotting, and overnight watch.
PREPARE · VERIFY · SET · WATCH
Night arrivals reward preparation and punish haste. Study the approach beforehand, confirm every position by instrument, set the anchor carefully, and maintain a watch all night. If you cannot confirm your position, abort to open water.
Before You Arrive
Study the Approach in Daylight
Approach an unfamiliar anchorage in daylight whenever possible. Study the chart, plotter, and pilotage notes before dusk so the approach is already familiar when you enter in the dark.
Check Tidal Height & Range
Know the current tide height and the full range overnight. Calculate depth at low tide to avoid grounding, and ensure your swing circle clears shallows at all stages.
Identify Hazards & Nav Aids
Mark all hazards (reefs, rocks, shoals, unlit moorings) and note which nav aids are lit and their light characteristics. Identify leading lights or sector lights that guide you in.
Plan the Entry Track
Pre-plan a safe track with waypoints and clearing bearings. Note a safe depth contour to follow and a turning point. Have an abort point — if you lose visual reference, turn back to open water.
Prepare Ground Tackle & Deck
Flake the rode on deck, free the chain, and have the anchor ready to drop. Brief the crew on roles, hand signals, and the plan. Have a powerful spotlight (handheld) ready but use it sparingly to preserve night vision.
Dim Screens & Preserve Night Vision
Dim chartplotter, instrument, and cabin lights to minimum. Use red lighting below. Allow 20–30 minutes for eyes to dark-adapt before the approach. Avoid looking at white lights or phone screens.
Approach & Anchoring Procedure
Slow Down & Confirm Position
Reduce to bare steerage. Cross-check GPS, chartplotter, and depth sounder against your planned track. Confirm you are on the safe side of your depth contour and clearing bearings.
Use a Spotlight Sparingly
Use a handheld spotlight only to confirm a hazard, a lit nav aid, or the anchor spot — not continuously. Sweep briefly, then look away. Continuous white light destroys night vision for you and blinds the lookout.
Post a Forward Lookout
Have a crew member on the bow as a dedicated lookout, scanning for unlit boats, mooring buoys, pots, rocks, and shadow lines. Communicate by hand signal or quiet voice — not shouting.
Follow the Planned Track
Steer your pre-planned track using the chartplotter and visual references. Confirm each waypoint and turning point against a depth or bearing check. If anything does not match, stop and reassess.
Confirm the Anchor Spot
At the chosen spot, confirm depth (at low tide), seabed type, and swing room. Check that no other vessel is too close and your swing circle is clear. Motor slowly to confirm the bottom is holding ground (sand/mud).
Drop the Anchor
Approach upwind/up-current, stop the boat, and lower the anchor smoothly — do not throw it. Pay out rode as the boat drifts back. Night anchoring is no different in technique; the difference is you must verify everything by instrument.
Set & Verify the Hold
Cleat the rode at full scope and gently reverse the engine. Confirm the anchor bites. Take two or three bearings on fixed lit objects (or GPS bearings) and note them — these are your drag references for the night.
Display Anchor Lights
Hoist or switch on the all-round white anchor light (and a second if over 50m). Turn off deck and navigation lights. Ensure the anchor ball is ready for morning. Confirm the light is visible from all around.
Set the Anchor Watch Alarm
Use SAIL-OFF's Anchor Watch feature to set a GPS drag alarm with your swing radius. Keep the device screen on and volume up. Set a second alarm for a periodic visual check.
Establish a Watch Rota
Assign anchor watches through the night. Each watch checks bearings, GPS position, wind direction, and other boats. Brief everyone on what to do if the wind shifts or the anchor drags.
Know Your Escape Route
Before settling in, confirm the exit route to open water if conditions change — a wind shift, swell, or a dragging vessel. Note the heading and clearing bearings so you can leave in the dark if needed.
WHEN TO ABORT
Entering an unfamiliar anchorage at night is optional — you can always heave-to or motorsail offshore and wait for dawn. Abort the approach if any of these occur.
Cannot Confirm Position
GPS and visual references disagree, or you cannot positively identify a nav aid or hazard — do not press on hoping it will clear.
Unlit Hazards Detected
The lookout spots unlit boats, buoys, or obstructions that were not on the chart — the anchorage is not what you expected.
Depth Discrepancy
The depth sounder does not match the chart for your plotted position — you may be off-track or the chart is wrong. Stop and verify.
Another Vessel Dragging
A boat already at anchor is dragging or re-anchoring erratically — its swing circle may conflict with yours.