Each chart currently consists of three data sets:
Horizontal positions are in decimal degrees; the horizontal datum is WGS84. Depths are in metres below chart datum. Note that all depths shown are mean depths, unlike nautical charts which use a "shoal bias" to show the shallowest waters in an area. The coastline is approximate and only to aid orientation.
As well as viewing the charts online, you can also download them.
Please note that by viewing or downloading any chart files, you are agreeing to the following terms and conditions:
We are currently finishing off fully automating the chart production process, and also producing a single, interactive display for both track and chart data. This means that chart production will always be fully up to date - until now we have had to rely on doing this manually whenever someone had time, and as a result chart updates have lagged far behind. This will then be followed by having the charts available in a number of formats for both mariners and GIS users. You can see the new viewer as it develops here.