Re: Fishfinder: mono or color?
A Color Fish Finder add no more information in my opinion. It does make it Easier to determine the density of a target. Is it mud or a hard rock?
However keep in mind a good brand Fish finder will last you a very long time if you take care of it. Example is Lowrance X50 I bought in 1981 still works perfect. Color units in general can be seen from more angles, you do not have to be right in front of the unit. Also if you get Mono today you may want to upgrade next year.
Buying your first fish finder you first need to know how your going to use it. Fishing for Black Bass in waters 10 to 40 feet then you do not need high power or high resolution and want a 200KHZ unit 20 degree transducer. If your fishing for bottom fish in the ocean at 450 feet then Power and resoultion is very important and you also want a dual frequency unit with a narrow cone angle.
Do not belive what they tell you in the spec. Example: depth up to 800 feet, what that really means is you can see a big flat rock if fresh clear water down to 800 feet, but to see a fish built like a stealth fighter max is more like 100 feet. In muddy water, or water with lot of air in like below a dam, or in ocean water with Salt, plankton and alge in it is more like 50 feet. I devide the clame by 8 and I think it is pretty close to how deep you can see Game fish. Know that Peak to Peak power divided by 8 = RMS power, so 800 watts PEP equals 100 watts RMS. Lowrance and Eagle like to say cone angle up to 60 degrees with ASP but it the industry standard 20 degree 200 khz transducer. They just mesure it at the -10 DB instead of the insdustry standard of -3 DB half power point. While the above is misleading in some condition it can be true it just depends if you measure in ways that people use the product.
Do some Brand research. For salt water on the west coast 80 percent of the commerical fisherman use Furuno, followed by Lowrance and Garmin.
Fresh Water I like Lowrance, then Garmin, then Furuno.
Humming Bird about 5 years ago had a problem where there was 3 to 4 threads running all the time saying I can not see bottom above trolling speed. Have not seen many threads since they came out with the matrix but for me would be my last choice of brands.