THE YEAR WAS 2015. I WAS WITH DAVE DUNN, GARMIN’S senior director of marine sales, aboard Capt. Mike Flowers’ Sea-Hunter 24 Ruff-n-Uff, slowly approaching Miami’s MacArthur Causeway. Flowers tapped his Garmin multifunction display, and it presented imagery from the Garmin Panoptix PS31 forward-looking sonar. ¶ Dunn cast a lure and, moments later, a tarpon appeared. A dance unfurled, and the target wisely dodged a root canal. ¶ Watching this episode on screen, I was gobsmacked by Panoptix’s LiveVu and RealVu perspectives, which combined information from the forward-looking transducer, multibeam sonar and phased-array technology to produce live, video-type imagery. ¶ Mostly, I was amazed that ceramic bits could yield this kind of water-column awareness. ¶ Darrell Lowrance helped introduce this technology to boaters in 1957 with his Fish-Lo-K-Tor, which provided depth…