[gap]

Originally Posted by V13dweller

The year was 1941 and the date was December 1st

Soldati class destroyers are equipped with better SONAR starting from 1 Sep 1943 (just before they switch to neutral) and better RADAR device since 1 Jan 1944 when they are on the allied side:

; SONAR

[Sensor 4]
NodeName=N01
LinkName=Type123A
StartDate=19380101
EndDate=19430901

[Sensor 5]
NodeName=N01
LinkName=Type144A
StartDate=19430901
EndDate=19451231

; RADAR

[Sensor 6]
NodeName=R01
LinkName=NULL
StartDate=19380101
EndDate=19410601

[Sensor 7]
NodeName=R01
LinkName=Type286
StartDate=19410601
EndDate=19440101

[Sensor 8]
NodeName=R01
LinkName=Type271
StartDate=19440101
EndDate=19451231

As for Type 34 German destroyers, dates are 1 Jun 1943 for improved SONAR, 1 Sep 1942 for improved RADAR and 1 Mar 1943 for an even better RADAR device. Also note that these destroyers are equipped with two identical RADAR's, though I am not sure how this fact would affect their hunting abilities:

; SONAR

[Sensor 4]
NodeName=N01
LinkName=Type123A
StartDate=19380101
EndDate=19400601

[Sensor 5]
NodeName=N01
LinkName=Type128A
StartDate=19400601
EndDate=19430601

[Sensor 6]
NodeName=N01
LinkName=Type147A
StartDate=19430601
EndDate=19451231

; 1ST RADAR

[Sensor 7]
NodeName=R01
LinkName=NULL
StartDate=19380101
EndDate=19400901

[Sensor 8]
NodeName=R01
LinkName=Type286
StartDate=19400901
EndDate=19420901

[Sensor 9]
NodeName=R01
LinkName=Type271
StartDate=19420901
EndDate=19430301

[Sensor 10]
NodeName=R01
LinkName=Type273
StartDate=19430301
EndDate=19451231

; 2ND RADAR

[Sensor 11]
NodeName=R02
LinkName=NULL
StartDate=19380101
EndDate=19400901

[Sensor 12]
NodeName=R02
LinkName=Type286
StartDate=19400901
EndDate=19420901

[Sensor 13]
NodeName=R02
LinkName=Type271
StartDate=19420901
EndDate=19430301

[Sensor 14]
NodeName=R02
LinkName=Type273
StartDate=19430301
EndDate=19451231

I suggest you to play with mission dates and see how improved sensors will affect destroyer's depthcharging accuracy

Originally Posted by V13dweller

and I only downloaded IRAI a few weeks ago, so I expect they have not released a new version yet.

Originally Posted by Navuhodonosor

This is the last and younger then few weeks.

I had already pointed you to the right IRAI version, here, but probably you missed my post

Originally Posted by V13dweller

Ok, after the deep water test with the newest version of IRAI the German destroyers are now using their depth charges, albeit with the shockingly bad accuracy as the Italians before.

Originally Posted by V13dweller

After an hour and fifty three minutes, it was the same chase and depth charge with appalling accuracy, with no British losses.

Letest IRAI revisions gave Allied destroyers intelligent and realistic strategies, but without the pinpointing accuracy of earlier versions. Now anti-submarine accuracy relies much more on crew veterancy levels, crew fatigue and different sensor's effectiveness, hence making enemies increasingly dangerous as the war goes on. In general, testing reports by many IRAI users have been favourable to enthousiastic. I don't see any reason why IRAI should use different settings for enemy and friendly units. In other words, I am sure that the lack of accuracy you are reporting is to be blamed to their early war poor sensors. As I suggested before, try changing mission dates

Originally Posted by V13dweller

But a German and an Italian Cruiser had a collision and sunk with all hands lost. (No lifeboats)

This is a known problem: SH5 collisions detection is not up to standard

Originally Posted by V13dweller

And for some reason the British subs fire ALL ten of their torpedoes at once!
SO they run out without a hit in most cases.

IRAI improves a lot AI sub strategies within the strict limits imposed by the game (the same can be said about planes). Your test could demonstrate that it is still not perfect, but I ignore wether there is still space for some improvement by TDW, or not.