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Selecting stars

In the last Nav Toolbox ("Calculating the time of twilight," Issue No. 90) looked at calculating the best time for shooting stars. In the morning, calculating the time of nautical twilight gets the navigator on deck when the brightest stars…

Cutting through the fog

From Ocean Navigator #118 November/December 2001 There are many times when radar is an invaluable tool, when electronic eyes that see through night and fog can make all the difference. Good radar and the skills to use it properly should…

Splicing rope to chain

Recent windlass models have all sprouted chain sprockets (wildcats) with a groove at the bottom of the chain teeth to grasp the rope part of a combination rode. The idea of a special groove to grasp the rope is not…

Nav Toolbox

The problem I have with calculating set and drift when crossing a current is not in the layout, nor in finding the correct heading. The mechanics of the problem are simple enough if it is laid out graphically. However, when…

Integrated radar

In the 1970s Gordon Moore, a founder of Intel Corp., maker of the Pentium chip, developed a rule of thumb for the evolution of microprocessors. "Moore's Law" predicts that every 18 months the number of transistors possible on a chip…

Bluewater Gear

Darrell Nicholson is a veteran voyager and delivery skipper with 11 years and 30,000 ocean miles of voyaging experience aboard his 1937 gaff-rigged ketch Tosca. He and his wife Theresa Gibbons have voyaged in the Atlantic, Pacific, and Indian oceans…