Alfredo Contaldo · vidéo

Ce que couvre cette vidéo

Navigating beyond 12 miles requires converting a true course plotted on a nautical chart into a compass heading by accounting for magnetic declination and deviation. Magnetic declination represents the angular difference between true north and magnetic north, which varies by location and year. Deviation is the error introduced by metallic objects on the vessel, which can be corrected using a deviation table or a professional compass compensator.

To convert a true course to a compass heading, subtract the declination and deviation from the true course. To correct a compass heading back to a true course, add these values. A simple mnemonic involves a three-step scale: true course at the top, magnetic course in the middle, and compass heading at the bottom. Descending the scale requires subtraction, while ascending requires addition. Annual updates to declination are calculated by multiplying the annual variation by the number of years elapsed since the chart's publication. Proper navigation requires using current, updated nautical charts rather than outdated editions.

Plus de vidéos de Alfredo Contaldo

Sailing from Sardinia to Menorca ⛵ 200 miles beating against the wind ⛵ Sailing Vlog EP.3 ⚓août 2026⛵ STUCK by the MAESTRALE in SARDINIA⚓30 knots at anchor - Trekking 🥾 and Snorkeling 🤿🌊 sailing vlogjuil. 2026From Sicily to the Balearics by way of Sardinia ⛵ 460 miles by sailboat with Maurizio EP. 1juil. 2026How to pass the chartwork exam for the boating license beyond 12 miles in 2026juin 2026

De Alfredo Contaldo — voir le bateau, l'équipage et chaque vidéo analysée de la chaîne.

The Sailing Directory Newsletter

Un e-mail avec les meilleures trouvailles de la flotte — les moments, les bateaux et les histoires qui valent la peine d'être regardés. Entrez votre adresse pour recevoir votre propre exemplaire.