#99204
Hari
Participant

Hy David,

That’s called CATZOC or Zone Of Confidance and provides an indication of ENC accuracy (IHO) so if you have a triange with 6 stars it means that you are in ZOC A1 and position accuracy is /- 5 meters.
If you have a 3 star it means that you are in ZOC C with accuracy /- 500 meters.
You can simply google Zone of Confidance or CATZOC for more info.