26/08/2026
Our GNSS sensors offer a 1-meter accuracy. But what about the maps?
"The most accurate chart surveys (graded as A1) have a positional accuracy of +/- 5m and depth accuracy of +/- 0.6m, for charted depths up to 10m.
The next grade down (A2) has positional accuracy of +/- 20m and charted depths of +/- 1.2m for depths up to 10m."
Interesting article in the last issue of Practical Boat Owner magazine.
There’s an accelerating shift away from electronic charts paper charts, but how best to use predicted data from digital aids in real-world situations?