I'm using a 585/TM260 combo. on the past few trips while deepdropping 600'-800', I haven't marked any fish on bottom but I know they are there because I am catching them. In the past on these same spots when the water clarity has been good, I always mark fish there. My question is this: Does the water clarity affect my machine as to keep it from marking that deep when it's dirty?? All machine settings are the same. I know that they are still down their because I keep pulling them up and taking em home with me. Why can't I see them in dirty water??