It removes most of the info from your mav map. No:-
uboat
ships
hydro bearings etc.
So as you cant see where you are - there is also no waypoint setting.
There is :-
land
radio reports
nav fixes (this tells you where you are within an error radius)
super marks (for making notes).
It is a bit scary when you first try but well worth the effort.
See some of Soianm's vids.
You can install and uninstall any time.
There are also scripts to help. See harbour pilot and my auto scripts.
They make it easier by auto adding nav fixes etc
