Navigation and Communication

Title Issue
Geographic range of a light

Geographic range of a light

Lighthouse visibility is available on charts, both paper and digital, and is stated in terms of nominal range.

Web Exclusives 2020
Celestial navigation series, part 12

Celestial navigation series, part 12

In this installment, we’ll discover moon sights and how they add a useful celestial body to your arsenal. We will also look at how to use celestial navigation techniques to determine your vessel’s compass deviation.

May/June 2020
Celestial navigation series, part 11

Celestial navigation series, part 11

In this installment, we’ll cover how to reduce a noon sight and also how to get latitude by shooting Polaris, the pole star.

March/April 2020
Celestial navigation series, part 10

Celestial navigation series, part 10

In this installment, we’ll cover how to reduce a planet sight; we’ll include a step-by-step breakdown of how to reduce star and planet sights, and we will also include a star sight problem to solve as a way to review what you learned in the last installment.

January/February 2020
Celestial navigation series, part nine

Celestial navigation series, part nine

In this installment, we’ll cover how to reduce a star sight and how to use HO 249 Vol. 1 to precalcuate what stars will be available.

November/December 2019
Celestial navigation series, part eight

Celestial navigation series, part eight

In this installment, we’ll cover running fixes and the hierarchy of positions from dead reckoning position to multiple simultaneous lines of position fixes.

September/October 2019
Celestial navigation series, part seven

Celestial navigation series, part seven

In this installment, we’ll cover the HO 249 sight reduction tables and how to plot a line of position (LOP).

July/August 2019
The wandering magnetic pole

The wandering magnetic pole

The Earth’s Magnetic North Pole, where the lines of magnetic force enter the Earth perpendicular to the globe’s surface, is actually a wandering location.

May/June 2019
Celestial navigation series, part six

Celestial navigation series, part six

In this installment, we’ll cover time, time zones and the Nautical Almanac.

May/June 2019
Celestial navigation series, part 5

Celestial navigation series, part 5

In this installment, we’ll cover sextants and sight taking, and the corrections you’ll need to apply to your sight.

March/April 2019
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