[jojotcb10]

First using the narrowband sonar I believe (the one used to classify a contact using the frequencies) how do I find out more of the frequencies? Usually when I pick up a contact that I know is a sub I only see the first 2 frequencies and a 3rd never seems to show up. I usually guess its an akula or victor and send off a torpedo and will still hit a decent amount of time but I would like to know for sure what I am shooting at. Also using that sonor there are obviously the wavey lines that you can scan thru looking for contacts but then there is that one section that dips down and is completely flat for like 30 or 40 degrees. Is that a blind spot or something? I can never pick up any contacts in that area? Sometimes a sub is cruising along that I am tracking and he seems to go into that flat area and I cant really track him anymore. I hope my explanation makes sense. I just cant figure out what that flat area is and what to do if a contact goes into that area.