If I recall from running a Type XXI before, yes, snorkeling should replenish the air in your boat. When I ran my XXI I never surfaced after leaving port, she is too clumsy and slow on the surface (15 knows surfaced, 18 submerged at top speed on the diesel engines). Historically the snorkel brought fresh air into the boat, and the engines got their air from the air inside the sub.
The radar...... I know I had radar and warning receivers on my snorkel and they worked while the snorkel was up. But I can not remember if they were extra, or if they came stock..... I also can not remember about how the 'mattress radar' worked in game. on the Type IX, you tell your radio operator to turn it on and off.
|