Hi Ray I use a garmin 160 sounder in mono,got it at can tire in the bargin bin for 95.00 new, fitting a new boat, but i feel i sould get a sounder with a much higher pixel count ( more detail ) and one with more watts ( stronger returns), I will be in the market next year for a new one and I would go color and possibly a combo unit, been doin my homework. boiled it down to 2 brands lowrance and garmin in my price range 300. to 600. no offence to anyone, do some study on how they work and try and understand that, there are lots of websites, once i new that, everything else fell into place and now i can apply it to the real thing. and if i might say the wife and I have been doing very well over here on the island around nanoose bay, good luck--- Clay