heres some good reading............ GPS Accuracy - How Accurate is it?
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I have down imaging and am satisfied with it.
I have down imaging and wish I had side imaging.
I have side imaging
I have standard sonar and am satisfied with it.
Sonar...I don't need no stinkin sonar. I am the fish whisperer.
heres some good reading............ GPS Accuracy - How Accurate is it?