rick you had it right,my lowrance 339IGPS...has it all,but it also costs $1,000 bucks,you only get what you pay for....and it has the most power of any unit under almost 5,000 .i learned that along time ago and you need lots of power if you are deep fishing or going at high speeds,with 4000watts of power and a dual frequency,its amazing detail, with a 200kh/50kh what i can see on my unit is amazing i can track cannon balls or see a double thermocline,its awsome....if you dont mind spending a grand than there is no equal, my advice is do your homework....cheers