All ships/submarines have own unique acoustic signature - its much safer for identiffication than using periscope.

Acoustic signature is also "coded" information about your contact:

Frequency String 1 – Generator Type
50 or 60 Hz for units
55 Hz and 65 Hz for torpedoes.

Frequency String 2 – Tonnage Factor
100 Hz – 41000 Tonns and more
130 Hz – 25000-34999 Tonns
145 Hz – 21000-24999 Tonns
160 Hz – 18000 -20999 Tonns
175 Hz – 15000-17999 Tonns
190 Hz – 12000-14999 Tonns
205 Hz – 9000-11999 Tonns
220 Hz – 6000-8999 Tonns
235 Hz – 3000-5999 Tonns
250 Hz – 2000-2999 Tonns
265 Hz – 1000-1999 Tonns
280 Hz – 500 – 999 Tonns

Frequency String 3 – Engine Type
310 Hz – Surface Steam
325 Hz – Sub Nuke
340 Hz – Sub Diesel
355 Hz – Surface Diesel
370 Hz – Sub AIP
385 Hz – CODOG
400 Hz – CODAG
415 Hz – COGOG
430 Hz – COGAG
445 Hz – GAS-Turbine
460 Hz – Torpedo Gas-Turb
475 Hz – Torpedo Peroxid
490 Hz – Torpedo Electric
505 Hz – Pump Jet Surface
520 Hz – ACTUV
535 Hz – Pump Jet Submarine
550 Hz – APR-2, APR-3, SHKVALs
565 Hz – DSRV
* - third frequency - it is not tied to any class – DDG, FF or CV, as it is in the default game sonar profile.
Only ACTUVs and DSRV tied to unique class.

Frequency String 4 and 5 – Unique frequency for each class
* - fourth frequency - it is not tied to any class – DDG, FF or CV, as it is in the default game sonar profile.

Additionally Narrowband signal is stronger than Broadband. It means first frequencies are visible much earlier than weakest BB signal

Experienced players spend 90% of "sonar" time in NB and only 10% (or zero) in BB

Thanks! I'll try that next time.


Also I found out why I was missing. The answer was in the weapons manual as you said.


Was basicly shooting from too far away.