I think color has it’s benefits. You don’t need that high of resolution with color units to get superior detail. I will try to take some photos of my LMS 330C this weekend and possibly post them next Tuesday when I return from the walleye opener. I’ve been around color units but never run one full time myself until this season. I’m already sold on the mapping but I will have to test the sonar on the water this weekend.
As for the black n whites, they’re better than ever with the higher resolution screens and other improvements in technology. The x125 will certainly get the job done, but you’ll have better luck with the x135 due to the white back-light and some other goodies. I was out on Clear Lake with Ryan Hale and we were running his new LMS 480. It’s basically the same as the x135 on the sonar side. It was outstanding in my opinion and Ryan said he loved it. The detail was very good on the sonar. The mapping was good as well, however we both agreed that color mapping would have it’s benefits, especially in sunlight. That test run helped me decide on the LMS 330C. With mapping not entering the equation at all, you might find that the x135 would more than meet you needs.
I don’t want to mislead anyone into thinking you MUST have a color unit because that is simply NOT true. I think the color unit provides the most benefit to those who plan on running navionics maps or lakemaster maps. The color can really help separate the depth contours, etc., especially (again) in direct sunlight.
These are my observations thus far. Others may have a different experience and I’d suggest getting all the input you can muster.