Humminbird 998c SI - Manual (Page 23)

13 Transom Mount - DualBeam PLUS™
858c & 958c Transom Mount Transducer Installation
DualBeam PLUS™ Transducer, XNT 9 20 T (858c and 958c only)
The DualBeam PLUS™ transducer uses a Two Piece Kick-up transducer
mounting bracket.
NOTE: Due to the wide variety of hulls, only general instructions are presented in
this installation guide. Each boat hull represents a unique set of requirements that
should be evaluated prior to installation. It is important to read the instructions
completely and understand the mounting guidelines before beginning
installation.
NOTE: Your transducer may not look exactly like the transducer shown in the
illustrations, but it will mount in exactly the same way.
Overview
If you will be installing a DualBeam PLUS™ transom mounted transducer, use
the procedures in this section. There are several procedures you will have to
perform in order to install a transom-mounted transducer. They are as
follows:
• Locate the transducer mounting location
• Prepare the mounting location
• Assemble the transducer and perform initial mounting
• Route the transducer cable
• Connect the transducer cable
• Perform a final test of the transom transducer installation.
In addition to the hardware supplied with your transducer, you will need a
powered hand drill and various drill bits, various hand tools, including a ruler
or straightedge, a level, a 12" plumb line (weighted string or monofilament
line), marker or pencil, safety glasses and dust mask, and marine-grade
silicone sealant.
NOTE: When drilling holes in fiberglass hulls, it is best to start with a smaller bit
and use progressively larger drill bits to reduce the chance of chipping or flaking
the outer coating.