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How Tests Were Performed
 
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8186
 
Lead Core Used
 
All tests performed using Sufix Performance Lead Core  #18 & #36 lb Test
Lead Core Based Sink rate
 
Sufix Sink #18 at 2.5 MPH  sinks 6 ft in depth for each color out up to 3.9 colors out.
If your brand core matches sink depth at 2.5 MPH no compensation is recommended.
When color out exceed 3.9 color based average sink depth starts decreasing.
A .1 MPH difference in trolling speed has imppact in sink rate

As speed decreases .1 MPH change will proportionately, and substantially impact sink rate.

Tolling Speed Accuracy Controlled
 
Trolling Speed was Control using Terrova trolling motor with iPilot 1.5 setup for speeds of 2.3 MPH or less and in conjuntion with Yamaha engine for speeds greater than 2.3 mph. All tests were performed when wind factor was 3 mph or less. The iPilot has an excellent speed control feature with 1 tenth increments. Speed was closely watch and test repeated on higher speeds for greater accuracy and averaging of slight difference. 
 
How was depth determine
 
The device used is called FishHawk. It has a five year life span.  Also used it to calibrate fish finders to insure accuracy. (FishHawk had Very Good repeatability.)
 
Actual depth readings taken
To date over 160 actual depth reading have been taken.
Curve applied speeds less than .6 mph where needed.
In Addition
 
Preliminary tests suggest compensation feature may be adequate  for used of 832.
 
Recommendation
 
Because amount of line out is based on targeted fish it stands to reason you should insure your fish finder is accurate as well. In most cases this is not an issue, just adds the depth of the transducer to the readout using the calibration feature of fish finder.  If you want to take this a step further you can suspend a detectable object at an exact height of 20 feet and calibrate to that. By calibrating your fish finder you will maximize accuracy of desire targeted depth.