Lowrance FishHunter 3D/PRO Operator's Manual page 28

the unit to the back of the trailer mount of your fishing boat.
Follow the steps below:
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You are going to be attaching the FishHunter to the
trailer mounting bracket on the back of your boat
You will want the FishHunter to be about 15 - 25 cm
(6 - 10") behind the back of the boat when you are
finished, so it will float freely in the water. The actual
length required will depend on the height of your trailer
mounting bracket.
A higher bracket means you will need slightly more line
The goal here is to have the FishHunter sitting flat on the
water with about 15 cm (6") of line free after it is attached
to boat. This will allow the FishHunter to sit flat in the
water while you are trolling it
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