This is a public domain document, a declassified copy of a mid 1960s operations and tactics manual for the Mk37 mod 0 torpedo. This is the variant without wire guidance, only active/passive homing. In game, our Mk37 is the mod2, the same torpedo basically but with the addition of wire guidance to supplement the active/passive homing.

It makes absolutely fascinating reading and many of the tactics can be applied in the game. It is also of interest to modders and even the developers as it is a primary source of factual information on the weapon system's characteristics, deployment, tactics and operational use.

Pages 2-6 through 2-28 are missing from the original.

The manual is hosted at non-profit sites hnsa.org and maritime.org. As a declassified federal government document it is in the public domain.

HNSA copy[archive.hnsa.org]
maritime.org copy[maritime.org]

Hosted here:[maritime.org]

It is worth calling out this section of the RCN Oberon-class submarine manual which is an extremely detailed guide to the operation of Mk37 torpedoes, including wire guided and homing-only types, also OTTO fueled Mk37C types, and also practice configurations as well as warshots:

https://maritime.org/doc/oberon/weapons/part3.htm

There are many interesting observations here including

• 300 yard minimum arming distance
  
• depth setting from 8 feet down to maximum depth.
  
• depth seeking begins immediately on launch
  
• no depth control after launch other than by homing, only azimuth (left/right) commands
  
• Mk37C has no speed setting unlike the electric Mk37s
  
• depth search pattern (up, then down, in a helix pattern) as well as snake and circle left/right
  
• if below 150' the search patterns all search up/down as well as left/right
  
• there are 3 phases: run to enable, then search (according to pattern, then homing)
  
• high speed (if it was selected) only starts during the final, homing phase
  
• the torp will not always accept commands during search and definitely not during homing (unlike in the CW standard model)
  
• if a homing attack fails it reverts to search mode
  
• there is an active-passive mode where the first homing pass is passive, all further re-attacks are active (we could simulate this in CW since we have command control of active vs passive)
  
• various safety features including "stratum" (depths to avoid), and anti-circle during run-in
  
• the 2 rear tubes of the Oberon will only fire non-wire Mk37s (including non-wire Mk37Cs)
  
• sounds like Oberon types had only 1 wire? Or otherwise only fire 1 wire-guided torp at a time

Starting in 1968 Northrop developed a significantly improved version of the Mk37 which improved many key characteristics - speed, range, hit probability, lethality - by 40% to 100%. It used OTTO fuel instead of batteries and had improved active sensors.

Northrop manual for the upgrade[maritime.org]

This manual covers procedures and tactics for the period prior to the earlier game campaign (1968) but many of the procedures and terminology would still have been in place in both campaign periods. It is also fully applicable to the use of the Mk16 torpedo or any other bearing-only unguided torpedo.

There is a comprehensive list of verbal instructions that could be used for adding voice effects.

Declassified public domain document hosted at https://maritime.org/doc/attack/index.htm

https://steamproxy.com/sharedfiles/filedetails/?id=894214300
https://steamproxy.com/sharedfiles/filedetails/?id=897349020
https://steamproxy.com/sharedfiles/filedetails/?id=1710023983
https://steamproxy.com/sharedfiles/filedetails/?id=1705586800
https://steamproxy.com/sharedfiles/filedetails/?id=1722640667