Marine Technology

A digital sextant

Sextants are wonderfully analog optical devices. A sextant user from the 1850s would have little problem using a modern sextant. Now a company in South Korea has begun offering something it calls the Korea Digital Sextant (KDS) that digitalizes…

Battery types

Wet cells: The de facto standard for high capacity batteries in boats for many years has been the basic wet cell lead-acid battery. These are somewhat simple in design. Plates are submerged in a liquid acid electrolyte contained in a…

Alarms, getting to know them better

Editor’s note: This piece originally appeared in the Ocean Cruising Club’s monthly bulletin (oceancruisingclub.org). This Maretron screen is from a sophisticated vessel monitoring setup. Green shows normal ranges, yellow indicates borderline and red signals an alarm…