Electronic charting is starting to include detail that is not available on paper charts
. I wonder how long it will be before it is considered poor seamanship not to have electronic charts
Some of this information can be very useful, some less so. The latest is Sonarcharts. These add a lot more depth
detail than is available on the normal electronic or paper chart. It makes the map too cluttered for normal navigation
, but this sort of depth
detail can be very useful when zoomed in, say approaching an anchorage. The sonar detail can be turned off and on.
The big question is how accurate is this data? How is it derived? The information is not on the equivalent paper chart.
I suspect it is a computer generated best fit, or prediction based on the available depths. Useful, but with obvious limitations. However, some of the information is actually different which does not fit with this theory.
Knowing how the data is produced would greatly help in choosing what level of confidence to place in the information. Does anyone know?
For those who have not seen the Sonarcharts here is a random anchorage with the sonar detail turned off and on. At this level of zoom the sonar chart is becoming a bit cluttered, but as you zoom in that problem disappears. The depths are in metres.