Quote:
Originally Posted by Fifi
Yes please!!  I totally agree! 
@ the team:
Don’t forget to correct the Porpoise Class wich actually gives sonar contact lines + speech with the deck hydrophone equipment (before 42)  |
The Porpoise, Narwhal, and S-Class subs have deck mounted Hydrophone receivers until June, 1942. When you go to the Hydrophone/Sonar Station, in order for you to "hear" a target ship, these subs will need to be at least at Radar Depth for the Deck Receiver to pick up anything. Hydrophone detection is called "Passive" because it doesn't do anything but "listen" to what's surrounding the sub.
The Sonar is considered "Active" because you actually have to do something to make it work (send out a "ping" and wait on it to return,
if it strikes something) as compared to the Hydrophones. The Sonar "Sending/Receiving Head" is on the bottom of the hull from the start of the war on all subs. Sonar is capable of being used by your Sonarman and its what shows on the Navigation Map, or what is described in the Message Text Box when the Sonarman states "Ship detected bearing xyz". He's using Sonar.
For the most part, think of the Hydrophone as the players device to detect surrounding ships. Think of Sonar as the players crew way of detecting ships.