A recent email exchange with a Mediterranean user drew my attention to a specific aspect of electronic charting : zoom limitation of a chart. ENC vector charts (¹) are classified in 6 categories depending scale : smallest scales less than 1:1.500.000 for global views to largest scale up to 1:4.000 for harbours and anchorages. (²).
In most cases, ENC S-57 (¹) official charts the most detailed have a scale about 1:4000, thus 1 cm on the chart (screen view) represent 40 meters on the ground. With paper chart, the only way to get more details is… to use a a magnifying glass, that provides, as we know, in no case more accuracy. But it is quite otherwise for electronics charts.



How make the new with the old ? Navionics knows it ! After publishing geographic areas including a navigation application, here is now an application, but without charting. Italian are too much !
In its newsletter of 22 October 2013, theOffice of Coast Survey, Department of NOAA (


As part of its policy aimed at offering users an ever more efficient and safe waterway, public institution Waterways of France (VNF) embarked on the production of electronic navigational charts on various inland waterways. The first two : the “Dunkerque-Escaut” and “La Garonne” connection are published.