Hi sorry to bring up an old threat, but I'm having the same problem.
Wondering if anyone found a fix for this?

After searching the forum and checking out many threats with no luck.
I have missed alot of contacts, just because the prat wont call out new contacts. I'm starting to think that he wont call contacts that are already in hydrophone range when I submerge, but sometimes he calls out NEW contacts that enter the range after I've submerged... make sense?
Could be just random behavior.
I have installed the 360 scanning hydrophone that cost 2000 renown.
I have patched my sh5.exe with TDW's program.
Here's my mod soup just in case there's something wrong with it.
Generic Mod Enabler - v2.6.0.157
[E:\Ubisoft\Silent Hunter 5\MODS]
MightyFine Crew Mod 1.2.1 Alt faces
sobers best ever fog V4 SH5
IRAI_0_0_30_ByTheDarkWraith
IRAI_upgrade_to_v_0_0_31
IRAI_0_0_30_No_hydrophone_on_surface_No_Aircraft_s potting
TheDarkWraith_DC_Water_Disturbances_v2_0_SH5
NewUIs_TDC_6_9_0_ByTheDarkWraith
EQuaTool 01.01 by AvM - Large Style
Trevally Automated Scripts v0.6
Trevally Harbour & Kiel Canal Pilot v2.8
sobers green crew training V3 SH5
Stormys DBSM SH5 v1.3 Basemod
Stormys DBSM SH5 v1.3 optional -6db damped Sonarguy
Stormys DBSM SH5 v1.3 optional NavMap babelling
Stormys DBSM SH5 v1.3 optional always shouting WO in normal mode
Stormys DBSM SH5 v1.3 optional scary creaks
Stormys DBSM SH5 v1.3 optional remaining orig sounds converted to 22Khz
Stormys DBSM SH5 v1.3 additional crew sounds beta6
OPEN HORIZONS II_base v1.6
TDW_Mines_Subnets_Detectable_in_hydro (OH II v1.6)
SH5Lifeboats_by_Rongel_TDW_stoianm_v2.1
NewUIs_TDC_6_9_0_Real_Navigation
MRP 16x9 ratio
Dark_Interior_V1
sobers real trees
sobers 3D deck spray mod V7
SteelViking's Sky Banding Mod
BRF 1.3 full
BRF 1.1 HP balance
Enhanced FunelSmoke1.2_by HanSolo78
Trevally Tutorial - All v0.2(for OHIIv1.3)
Trevally TDC Help v2
SAS special abilities simplified V1 SH5
U-boat Historical Specifications 1.7 for TDW Mods
Depth_Keeping_Problem_UHS_patch_HB_2_0_0_TheDarkWr aith
Equipment_Upgrades_Fix_v1_4_byTheBeast
NOZAURIO'S SKIN (Standar No Emblem) v-1.0.0
This is becoming a game killer for me... must be a way to solve this