David Burch Navigation Blog
Notes on marine navigation and weather
Friday, June 6, 2025
Role of qtVlm in the Starpath Coastal Nav Course
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Starpath School of Navigation offers several online courses that use qtVlm for electronic chart work. In our Electronic Chart Navigation ...
Wednesday, April 30, 2025
Shapefiles for qtVlm
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A powerful function of qtVlm is its ability to show shapefiles in a very convenient manner. They can even be configured to include links to ...
Thursday, February 27, 2025
Digital Soundings and Water Depths from OFS Forecasts
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The Operational Forecast System (OFS) model forecasts tide height and tidal currents for 15 locations around the country — a true revolutio...
Saturday, February 22, 2025
Predicting Tidal Currents in the Swinomish Channel
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Historically there have been no NOAA predictions for the tidal current speed in the Swinomish Channel flowing past La Conner, WA, but local ...
Tuesday, February 11, 2025
The New Revolution in Tide and Current Predictions.
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First published on OceanNavigator.com / updated here Feb 17, 2025 We had one tidal revolution in 2021 when NOAA announced that they were ...
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