"But sonar was tracking it, as you can see in the first screenshot. I have narrowband lines.
Those go away as soon as the radar goes down. Doesn't make sense."
Agreed.
"I wasn't at 1.8k yards. Check the map scale. They're about 16k yards away."
This again makes me wonder if the noise level combined with your radar activity caused you to be detected, the contact then slowed or changed heading reducing your ability to keep the passive sonar track under the conditions and 9 miles away.
Added:
The key would be to make this happen again and raise/lower your radar more than once to see if the sonar contact comes back with it raised.
-Pv-
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