A Guide to Sailing at Night: Expert Advice from Ambassador Andreas B. Heide

In this guide, Andreas shares the principles he relies on when sailing through the night.

Night sailing holds a unique place in the rhythm of life at sea

The world narrows to the glow of instruments, the sound of water against the hull, and the steady discipline that keeps a crew moving safely through the dark. For many sailors, it becomes one of the most rewarding parts of a passage: calm, focused, and beautifully stripped back.

Henri-Lloyd ambassador Andreas B. Heide knows this environment intimately. A professional sailor, marine biologist and founder of the expedition vessel S.V. Barba, Andreas has experience that stretches from polar waters to offshore passages under some of the world's most demanding conditions. A former military diver and naval officer with an MSc in Marine Biology, he brings a rare combination of technical skill, environmental knowledge and seamanship to every journey.

In this guide, Andreas shares the principles he relies on when sailing through the night. These insights are shaped by thousands of hours at sea and grounded in practicality, confidence and respect for the ocean.

Understanding the Night Environment

Darkness changes your senses, your decision making and your reliance on instruments. Where daylight allows for instinctive adjustments, night navigation asks for discipline, preparation and a calm, methodical approach. The aim is not to fight the darkness, but to work with it.

1. Protect Your Night Vision with Red Light

Your eyes can take up to 30 minutes to adjust fully to darkness. A sudden burst of white light resets that adaptation instantly.

Andreas recommends ensuring head torches default to red mode, not white. Red preserves your natural night vision, allowing you to move confidently around deck, check lines, review instruments or communicate with the crew without losing your ability to see beyond the boat.

Below deck, red lighting creates a softer environment for navigation and log entries, particularly on long passages.

2. Build Trust in Your Radar Before Night Falls

Radar is one of the most powerful night time tools on board but only if you already trust the information it gives you.

Andreas advises using radar extensively during daylight hours. Learn how land masses appear. Compare AIS targets with radar returns. Understand how sea state affects clutter. Once these connections become instinctive, your radar becomes a reliable extension of your senses at night, not a distraction.

3. Use Spreader Lights for Controlled Illumination

There are moments when you need clear visibility on deck: adjusting sails, entering a narrow passage or assessing rigging.

Spreader lights, when used sparingly and with purpose, provide strong downward lighting without blinding the crew. Andreas uses them to illuminate tight manoeuvres or to understand deck layout when visibility is low. The key is balance. Light when needed, darkness when not.

4. Maintain a Red Light Environment Below Deck

Night sailing is a full crew transition. Moving below deck should not feel like stepping into daylight.

Keeping the nav station and interior lights red prevents visual disruption and ensures those coming off watch remain adapted to the dark conditions. It supports a smoother rhythm, especially on longer passages where sleep cycles matter.

5. Extend Your Vision with Thermal Binoculars

When the horizon disappears, identifying hazards becomes critical.

Thermal binoculars can detect heat signatures, highlighting vessels, buoys or wildlife long before they become visible to the naked eye. While not essential on every boat, Andreas highlights them as a powerful tool for busy waters or low contrast conditions like fog.

6. Keep Watch Rotations Consistent to Reduce Fatigue

Night sailing can be physically and mentally demanding. Fatigue affects judgment, reaction time and situational awareness.

Consistent watch systems, whether two hours on and four hours off or a format that suits the crew, allow your body to find a rhythm. Andreas emphasises predictable cycles to maintain clarity and reduce stress, especially during offshore passages.

7. Embrace the Night

Perhaps the most unexpected advice Andreas offers is simply to enjoy it.

Once you settle into darkness and your senses adjust, night sailing reveals its own beauty. Bioluminescence, silence, clarity of stars and the deep focus that arrives when the world goes quiet.

Night sailing becomes less something to endure and more something to appreciate

Final Thoughts: Confidence Through Preparation

Sailing at night demands respect, not fear. With the right preparation and mindset, it becomes one of the most rewarding aspects of life offshore.

From protecting night vision to managing fatigue, Andreas B. Heide’s guidance is shaped by real offshore experience. His approach mirrors Henri-Lloyd’s own philosophy: clarity, discipline and performance without compromise.

Whether you are embarking on your first overnight passage or refining your offshore skills, these principles provide a foundation for safe, confident and inspiring night sailing.