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The other was that the two boats had been operating fine, but inadvertently navigated into Iranian territory.
Simply put, they got lost.
Neither account seems possible.
.......... snip..............It turns out that navigation and navigation equipment are kind of a high priority for the Navy.
Boats don’t get lost. Highly technical navigation equipment on both boats would have told crewmembers exactly where they were.
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Actually, simply getting lost is, to me, a plausible explanation and even the most likely. Certainly it's not impossible. Here's why:
True, they have excellent navigation gear on those boats, but they're run by humans. That's the short answer. Here's some background.
I'm reminded of the time I delivered an F-8 Crusader (single seat, single engine, fighter) from California to Viet Nam many years ago in the days before GPS. We were a flight of two aircraft. I was still an Ensign and the flight leader was a Commander. I was tasked with the navigation duties which involved mostly Dead Reckoning with only a hundred miles or so of Tacan (radio) navigation at the start and end of each leg. It was exciting and challenging and I took my duties very seriously which included many hours of pre-planning, gathering wind information from airliners, calculating wind drift, etc. etc. etc. I remember that when we made landfall in Hawaii on the first leg, we we had an error of 30 seconds in our ETA (estimated time of arrival) and a course error of 3 miles south of track. I received a letter of commendation for that mission which lasted for 10 days.
For shooters not familiar with dead reckoning navigation, it's sort of like taking a rifle zeroed at 100 yards and, after consulting a ballistics book and estimating the winds, adjusting the scope and taking a shot at 1200 yards AND hitting the target.
At the same time our flight of two F-8s were crossing the Pacific, a flight of six F-4 Phantoms were doing the same thing using the same aerial refueling tankers. But they were otherwise not associated with our mission in any way.
The Navy F-4 has a Radar Intercept Officer in the back seat who also functions as a navigator. The RIO in the lead aircraft used his rudimentary on-board navigation computer (something we F-8 guys didn't have) which relied on radar returns from the air-intercept to measure the wind drift and determine the proper heading to fly. This is something I did manually using a hand held "wiz-wheel". On the third leg the RIO of the lead aircraft input some inappropriate route points and got lost. ALL FIVE of the remaining aircraft were simply following the leader and nobody was doing back up navigation or cross checking the work of the lead navigator. For those who don't know, when conducting dead reckoning navigation out of range of land based radio navigation systems, once you get lost you have no easy way to re-establish your position. In other words, you're more or less screwed. Through some amazing luck and some fancy radio direction finding by one of the Marine Corps C-130 tanker navigator, the flight of 6 Phantoms was saved.
We heard this cluster-f**k on the radio and when we landed in Guam my flight leader, a very senior Commander, tracked down the F-4 group and gave the leader an a$$ chewing the likes of which I had never seen before or after. We were astounded that twelve qualified airmen, 6 aviators and 6 RIOs would risk their aircraft and their lives in such a stupid way. Even though my flight leader was not in the direct chain of command, he restricted the entire F-4 flight to their quarters for the night and ordered them all to develop a detailed navigation plan for the next leg which he would examine the next morning. Meanwhile, we went to the Officers Club for a few drinks to toast our precision navigation efforts. Later on, the F-4 flight leader received a letter of reprimand in his permanent file.
The point of this too-long sea story is that sophisticated navigation gear is no guarantee of success. There are countless examples of airliners landing at the wrong airport, and in the case of Korean Air Lines Flight 007, they got shot down by the Russians and 269 people died. That was because the pilot navigating tried to engage his inertial nav system with an offset of greater than 7.5 miles, so it remained in the armed mode without ever engaging. They simply flew along fat dumb and happy with nobody cross checking anything until a Major Gennadi Osipovich put a missile up their rear-end.
I'm guessing somebody screwed up the navigation of the lead boat and everyone else was doping off and not paying attention. That's a good recipe for getting your teat in a wringer, for those old enough to know that that means.
State-of-the-art nav gear will not, by itself, keep you out of trouble especially if the humans running that gear aren't doing their duty.