Venice had an essay on 'tacking' at one time, on her website.
Tacking became a 'plausible' (the fools will swallow it) sounding 'explanation' (excuse) for the vagaries of JW insights ('prophecies that we can't call prophecies').
The trouble is WTS was really doing 'flip-flops', which are complete reversals (180 degree turns). Tacking only is a partial turn to go 'across the wind' not 'into the wind'. So the analogy is very poor and fails miserably. A really better descriptive term than 'tacking' would have been 'spinning your wheels'.
Someone documented about a half dozen reversals on the fate of the inhabitants of Sodom, as I recall. This is a good example of 'tacking' at its finest.
GodRules recent whining departure is another good example. He forgives the GB for their numerous mistakes as being 'only human'. This is NOT A TACTIC THAT THEY WILL DO FOR THEMSELVES. They take on the 'prophets mantle' with great trepidation, knowing the consequence.
So they 'blow it', with something that is wrong. They won't (can't) apologize or admit their error, as that is an admission of guilt. For in taking on this responsibility, they have said they are the ONLY CHANNEL, ARE 'SPIRIT DIRECTED' and are THE MOUTHPIECE OF GOD.
('SPIRIT DIRECTED': now there is a great one. They had to make up those weasel words to keep the lightning in the heavens and off their doorstep.)
They (the GB) knew the risk they are taking and can only brazen it out by claiming further omnipotence and daring anyone to dispute or take notice of the failure. The GB knows that it can't back up, but GodRules lets them off the hook. Sorry, the Bible, taken for what it says, doesn't work that way. If they were humble, as perhaps GodRules might be, they would confess and 'come clean' of their error.
Something along these lines, with lots of WT literature references over the years usually works well.
Mustang