Yeah, as much as we whine about rec boaters pranks, I have to wonder what they think of my deliberate S-pattern? :-)
(Shameless plug follows) I cut my teeth on sonar 35 years ago testing old stockpile samples of sub-seeking munition sonar. They ran on RCA vacuum tubes and a mag vynyl tape drive, and they were freakin' awesome. I'd love to have one today, and go ping up some silver carp sometime.
They had an expected shelf life of 40 years, but an actual use life of far less than the 3 minutes of tape. The ones I checked were ~20 years old, not a one missed a beat. Ever.
Now that I told you, I'll have to kill you. Ha! I ain't movin' to Russia.
The stuff we use is the finesse version, but it works the same.