I have the x67c and was worried at first because it says in the manual it should not be stored in temperatures below -4. With that being said, I store mine indoors, just in case. But I have used it in temps down to -20 with no problems. It is relatively easy to use. You can see the lure and it has a real-time flasher that you can choose multiple color patterns. It can get kind of hard to read in sunlight, but after adjusting the colors, it seems to work well. I do get interferrnce from other units nearby, but overall, I am happy with it.
Lowrance X67c Fish finder - - -
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Even eminent chartered accountants are known, in their capacity as fishermen, blissfully to ignore differences between seven and ten inches, half a pound and two pounds, three fish and a dozen fish. ~ William Sherwood Fox, Silken Lines and Silver Hooks, 1954