Originally Posted by Franziska
I am talking of information which is NOT readily available without local knowledge.
Avoid local knowledge. It is often inaccurate: locals sail by heart, they will tell you there is a rock but not tell you exactly where. To navigate, you WANT the position and the more accurate it is, the better.
You are better off with info gathered from other cruisers - those who had a close shave and those who had no such luck.
Back to your project
, I think the dangers could get admiralty style 'grades' - to quickly and clearly tell the quality of information on which we based our entry into the dangers list.
BTW - how do we make an accurate gps
fix of a danger
, without landing / crashing on it?