David Burch Navigation Blog
Notes on marine navigation and weather
Saturday, December 27, 2025
Evaluating wind models in 2025 Sydney-Hobart Race
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We have been following the TransPac52 fleet in the 2025 Sydney Hobart Race as a way to learn about evaluation of currents and winds and ro...
Wednesday, December 10, 2025
The Three Sets of Nautical Chart Symbols We Need to Know
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In 2025, all traditional paper charts were permanently discontinued, after which the only official NOAA nautical charts are the electronic n...
Monday, November 10, 2025
NOAA's New Nautical Chart Numbering System
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Official US charts with chart numbers started with the founding of the US Coast Survey in 1807 that evolved through several forms into the m...
Monday, October 27, 2025
WA State Nautical Charts in Flux
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All paper charts across the country were discontinued at the end of last year, leaving electronic navigational charts (ENC) as the only offi...
Friday, October 17, 2025
qtVlm Training Mode — Available to all Schools
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We designed the Training Mode supplement to qtVlm to be available to all schools that teach marine navigation or weather. The getting_starte...
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