Lowrance HDS series Installation Manual page 22

If you drill a hole in the transom for the transducer cable, make sure it is located above
the waterline. Seal the hole with an above or below waterline marine grade sealant. Route
the transducer cable to the sonar unit. Make sure to leave some slack in the cable near the
transducer.
Use caution when routing the transducer cable near other wiring and cables. If you need to
drill a hole in the transom to pass the connector through, the hole size will depend on the
connector on the end of the transducer's cable.
Make a test run to determine the results
At times you may need to adjust the transducer higher or lower. The slots in the mounting
brackets allow you to loosen the screws and slide the transducer up or down.
Full sonar fish arch
If the sonar screen is displaying partial fish arches, as shown in the previous top two images,
the transducer could be at an improper angle. Check the transducer and make sure its face is
parallel with the bottom, as shown in the bottom example. If you frequently lose bottom signal
lock the transducer may be coming out of the water as the boat crosses waves or wakes.
Move the transducer a little lower in the water to see if that improves sonar performance.
When fishing around underwater structure the transducer may be kicked up from object
strikes. If the transducer is being kicked up too often, try moving it a little higher for more
protection.
Improper transducer
angles
Partial sonar
fish arches
21
Transducer face parallel
with the bottom.