Yea, what
I said.

(Well, nearly to what I said. A couple of yards off, here or there.)
I'm wondering Double R if you used the same target ship in all the positions? Just curious.
Also, I'm wondering if the difference in the exact range and sonar has something to do with the angle of the targets. Are they presenting an A-Beam position (AoB 90 degrees) in all positions, or are they randomly angled? When I've set up my target tests I usually have them angled to give me as large a silhouette as possible, just to be consistent.
I know the sonar has the modded feature of not picking up the rear 60 degree arc (between 150 and 210 degree positions). Just wondering if having the sub face East would make a difference in the targets found range at the 305 degree position when facing West (when facing East, the same target should be found at the 125 degree position)?