TB23 is the port array TB29 is the starboard array so im told (dont take it as gospel though) the TB29 is said to be more sensative.
To find a submarine you first need towed array deployed and looking on the narrowband sonar, there will be 2 contacts one is fake (ambiguous) the second is real, to find which is real mark both on the narrowband then execute a 45 degree turn either way doesnt matter.
If one of the contacts moves then its fake the other contact should then go to MASTER or M01 (depends on contact numbers)
Thats the basic anyway, then you can classify and work out how fast its going from the demon display.
I recomend visiting
www.subguru.com on the downloads page and have a look at the manuals that have been written, if you need anyhelp then PM me (note i mainly do russian submarines only! and also under the ice Arctic ocean)