David Burch Navigation Blog
Notes on marine navigation and weather
Saturday, January 10, 2026
Access Historic OSCAR Currents in GRIB Format
›
We have long suggested that the satellite based measurements of ocean currents called OSCAR ( Ocean Surface Current Analyses Real-time ) are...
Saturday, December 27, 2025
Evaluating wind models in 2025 Sydney-Hobart Race
›
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
›
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
›
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
›
All paper charts across the country were discontinued at the end of last year, leaving electronic navigational charts (ENC) as the only offi...
›
Home
View web version
