The tacking of His Majesty's Sailing Vessel the "Watchtower" registered in Brooklyn NY.
The doctrinal changes were compared by the wt writer, Klein to the tacking of a sailing vessel in its effort to reach her destination. the rub?
Only if you steer against the wind (pneuma aka HS), is there need to tack. very appropriate though, because wt is getting ever farther from the goal for the jws, now set at ~ 2075. The tacks becoming ever tackier, overlapping supposed final leg.