Lowrance electronic X86 TX - Manual (Page 18)

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1. Anchor the boat in about 30 feet of water. Add a little water to the
sump of the boat. Plug the transducer into the sonar unit, turn it on,
then hold the transducer over the side of the boat in the water. Adjust
the sensitivity and range controls until a second bottom echo is seen on
the display.
You will need to turn off Auto Sensitivity, Auto Depth Range and
ASP
. Try a range setting that is two to three times the water depth.
The harder (more rocky) the bottom, the easier it will be to get a second
bottom signal. Do not touch the controls once they have been set.
Example of a second bottom signal. Unit is in 30 feet of water, with
range set at 80 feet and sensitivity set to 87 percent
2. Next, take the transducer out of the water and place it in the water
in the sump of the boat, face down. Notice how the signal strength de-
creases. The second bottom signal will probably disappear and the bot-
tom signal intensity will likely decrease.
3. Now move the transducer around to find the best location with the
strongest possible bottom signal. If you find a spot with an acceptable
bottom signal, mark the location and move on to step 4.
If you can not get an acceptable bottom signal, try turning up the sensi-
tivity by three or five keystrokes and then move the transducer around
once more. If you find a spot that works, mark it and move on to step 4.
If you have to turn up sensitivity by more than five keystrokes to get a
good signal, the transducer should be mounted on the outside of the
hull. This is especially true if you have to turn sensitivity all the way
up to get a decent bottom signal.
4. Most people can get good results by following steps 1 through 3, so
this step is optional. If you want to make an extra effort to be abso-
lutely sure that your selected location will work under all conditions,
make a test run with the boat on plane and observe the bottom signal.
True bottom
Manual range setting
Second bottom