Navigation

Increase plotting precision

What precision is needed when plotting positions on a chart? Mariners have lived with the "inaccuracy" of celestial navigation, so one might argue that "four miles is close enough." This is probably true on a passage far from land when…

Electronic changes

The world of electronic charting has been changing rapidly over the last few years, and it does not look like it will stop anytime soon. Vector charts, in particular, are hot. Last year Nobeltec introduced the first U.S. PC navigation…

The three-shot rule

One of the hallmarks of a competent celestial navigator is the ability to take quality sights under almost any conditions. However, even the most practiced navigators recognize that often a sight that seems of high quality when first taken may…

Sea anchor survey

In November 1998, nearly all participants in the West Marine Caribbean 1500 Cruising Rally experienced high seas and strong winds generated by the remains of tropical storm Mitch as it roared from the Florida coast eastward past Bermuda. Most of…