Canal cruising is as benign as it gets yet there are still lessons to be learned. For example, eddies can form when water flows around bridge piers. Nellie traditionally responds to these by doing a little s-turn. But, hold on, Nellie's "jig" is occuring even when there isn't a current. Clearly something else is going on. The "something else" turns out to be the autopilot; specifically its fluxgate compass. Huge chunks of steel, like bridges, disrupt the surrounding magnetic field. Of course Nellie's autopilot doesn't know it's under a bridge, it just knows that magnetic north has moved and responds accordingly. We also notice the"jig" when going over a submerged pipeline. Nellie's like a good hunting dog. But, instead of going on point for a bird, she "jigs" for metal.
On the Wall in Vibrant and Pretty Fairport, NY |