I have been using
Navionics charts extensively on MacENC but am now migrating to
OpenCPN.
Next season I will be cruising only on the UK south coast, West Country and
France and Channel Islands. So I have purchased the oeSENC
charts for British Isles and
France Atlantic. There are various 'holes' in coverage as mentioned on the o-charts web site. I have already found other areas where detail is inadequate for
navigation, such as Christchurch, Dorset, the Swinge channel near Alderney. No doubt there are others.
What do other users recommend as an alternative or for infilling? o-charts suggest
buying S-63 charts but it is hard to find what I need without the ChartWorld Graphical Chart Selection tool and I am Mac only so cannot install it. The
Navionics S-63 charts on ChartWorld are expensive.
Having detailed charts available for places one might end up diverting to as a refuge - not just planned
ports - is looking very expensive.