Sonar Bearing errors to TDC?

Galanti · 03-04-08, 09:21 AM

Last night I opted to run a sonar attack against a large maru, as seas were pretty high and I was concerned about broaching and alerting the enemy. I took my marks and speed estimate from the periscope, then submerged to 80 feet to continue with the sonar. I pinged for range and continously sent bearings to the TDC.

When the time came to shoot, got a final ping for range, and then fired three fish, sending the bearing via sonar for each shot. The results were wildy off by about 30-40 degrees.

What went wrong? I'd used sonar for ranging before, but have never used it to send bearing data. Could it be because I had the sonar man track the closest target, and then used the order bar to ping and send bearings rather than rotating the sound heads myself and the clicking the varioous knobs at the station?

03-04-08, 09:21 AM	#1
Galanti Captain Join Date: Apr 2004 Location: Ottawa Posts: 536 Downloads: 106 Uploads: 0	Sonar Bearing errors to TDC? Last night I opted to run a sonar attack against a large maru, as seas were pretty high and I was concerned about broaching and alerting the enemy. I took my marks and speed estimate from the periscope, then submerged to 80 feet to continue with the sonar. I pinged for range and continously sent bearings to the TDC. When the time came to shoot, got a final ping for range, and then fired three fish, sending the bearing via sonar for each shot. The results were wildy off by about 30-40 degrees. What went wrong? I'd used sonar for ranging before, but have never used it to send bearing data. Could it be because I had the sonar man track the closest target, and then used the order bar to ping and send bearings rather than rotating the sound heads myself and the clicking the varioous knobs at the station?