The problem is that all targets, even those at anchor or moored,
cause an alarm. I understand the logic behind this, but in my mind these
are false alarms.

Well, if you're moving then their being anchored is still a problem.

I can also understand why, from a liability perspective, they'd still want
to issue an alarm for them.

But yeah, I'm with you on wishing the alarm function was a little smarter.
Or that the sound used for alarms was configurable instead of just one for
all of them.