Quote:
Originally Posted by TNtroller
Nice pics as usual. Are the blurs caused by your paddle stroke?
Must have been a new condo/apartment development, ready for occupancy but no tentants.  |
You can see the paddle stroke near the center lines...that is not the cause of the blurs. These units work off the Doppler shift principal....meaning something has to be moving. In the case of the sonar the boat has to be moving and preferably in a straight line. If you turn...even though it might only be slight....you can create a zero Doppler shift.....or start going into zero Doppler. Meaning you are now technically not moving away from, or closer to the object because you are in a slight turn and you don't get much Doppler shift to give you a clear picture. Being in a kayak it is easy to shift a little one way or the other with the paddle stroke....but to me it works great. While I am no sonar expert I was in the missile business for 38 years and my main area of expertise was continuos wave Doppler tracking radars. The principal is the same. Sonar just uses sound waves versus radiated frequency. These units have to be moving for them to work correctly. But once you use one of these and know what you are looking at even though the wind is just pushing you along at a very slight speed you can see fish...beds...trees....even though they are blurred and distorted you know what you are looking at....but still it is best to be moving at one MPH or better for good results. I keep my scroll speed at 2 as that is my MPH reading while paddling...most of the time. Next spring is going to be an epic year for me for catching shell cracker....Gills.....God willing. I have lost count of the beds I have marked and the best ones are those in that 5-8 foot depth range. Not easy to see those with the naked eye like a bed in 3 feet of water.
Regards