Raymarine E66008 Owner's Handbook Manual page 39

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Chapter 2: Installation
WARNING:
Always wear safety goggles and a dust mask.
3. This is the least desirable testing method, as it may be difficult to
A
Figure 2-13:
Observe the Fishfinder's performance and compare it to the baseline.
Look for a stable depth reading that is similar to the baseline, compare
the thickness and intensity of the bottom trace.
If the performance is close to the baseline, this is a good mounting
location. Remember, some energy is lost transmitting through the
hull.
If the test reading differs markedly from the baseline, you need to find
another location to install the transducer.
If there is no reading or it is erratic, the sensor may be positioned over
coring which is absorbing the acoustic energy. Choose another
location. If no other spot is available, check with the boat
manufacturer to be certain coring is present before proceeding
with Installation in a Cored Fiberglass Hull on page 37.
remove all traces of the petroleum jelly before bonding the base to
the hull.
i. If the hull surface is not smooth, grind it with a disc sander.
ii. Coat the face of the sensor with petroleum jelly.
iii. Press it against the hull with a twisting motion (see Figure 2-
13 C).
B
Testing the Transducer at the Selected Location
33
C
D5001-2