Question about Navagation Map SH4 stock 1.4

[randyrab]

Thanks in advance. When you click on an enemy vessel on the Map, what are the 3 grey circles that surround the vessel at different radii depending on type of vessel? I am assuming something like visual range, radar range, sonor range?? Especially the little short moon shaped arcs around the DD's?

[ex250]

I believe the outer circle is visual range.
The middle arc is probably gun range which is misleading because DD's can shoot 360 degrees.
The little part right in front of the bow is for sonar.