>>1513927>Garmin Striker 4I have one of my own. I love it. If you can upgrade 40 bucks for contours I'd jump at that faster than a duck on a junebug. Contour maps are the only major selling difference I notice between the striker 4 and my helix 10 on the big boat. You'd have to pay double the price of a striker to get a machine at that level. I can't speak on CV, but I think your own feel for the sonar will always outperform a computer program. Going to use my striker out on the kayak tomorrow after a long season of yanking in fish through the ice.
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