The vents emit burning methane thought to be of metamorphic origin, which in ancient times were landmarks by which sailors could navigate.

In ancient times sailors could navigate by the flames, but today they are more often used to brew tea.

Beyond the pier, fishermen in their small catboats pulled their nets and sailors navigated their brightly colored catamarans away from land.

In calmer weather the breakers beat upon them ineffectually, and even the most hopeless sailor could navigate them with ease.

To enter St. George's Harbour, sailors must fly a yellow quarantine flag, and navigate the ship towards the Customs dock.

A lighthouse at the cape has helped sailors navigate the Sea of Japan for more than a century.

Ancient sailors navigated by the sun and the prevailing wind.

At the time of departure, Cartier had to leave the Petite Hermine to Sainte-Croix harbor because he did not have enough sailors to navigate.

As there are 21 placenames written on the American coast, one possible explanation is that sailors had previously navigated these coasts.

Old-school sailors navigate by wind direction, landmarks and the seat of their pants.