NAVIONICS Chart Land Boundary Marks?

There is a lot going on in that area. The lines are called COLREGS Demarcation Lines and delineate those waters upon which mariners shall comply with the Inland and International Rules. COLREGS Demarcation lines are contained in Title 33 of the Code of Federal Regulations, part 80 (33 CFR 80), the Navigation Rules manual. Mostly in that area there is tons of buried cables and while you can navigate that you can't Trawl, Lay Cables, Dredge and note it is an anchorage danger area. I guess there is a lot under the water down deep there.
Having the chart, it is pretty easy to play with the settings. It doesn't explode, or anything. I played with the shop unit and found turning OFF the slider for "Cautionary Areas" under the Vector Chart (HOME - SETTINGS - VECTOR CHART) will remove them from showing up.
 
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