Installation Of Antenna Unit; Installation Or Transducers; How To Mount A Transducer Through The Hull - Furuno GP-1670F Operator's Manual

13. INSTALLATION
13.2

Installation of Antenna Unit

Mounting considerations
The antenna unit GPA-017/017S (option) is available for receiving GPS signal with far-
ther sensitivity.
Select a suitable mounting location considering the following:
• Select a location out of the radar beam. The radar beam will obstruct or prevent re-
ception of the GPS satellite signal.
• The location should be well away from a VHF antenna. A GPS receiver is interfered
by a harmonic wave of a VHF antenna.
• There should be no interfering object within the line-of-sight to the satellites. Objects
within line-of-sight to a satellite, for example, a mast, may block reception or prolong
acquisition time.
• Mount the antenna unit as high as possible. Mounting the antenna unit as high as
possible keeps it free of interfering objects and water spray, which can interrupt re-
ception of GPS satellite signal if the water freezes.
• If the antenna cable is to be passed through a hole which is not large enough to
pass the connector, you may unfasten the connector with a needle nose pliers and
3/8-inch open-end wrench. Refasten it as shown below after running the cable
through the hole.
• If the internal GPS antenna is used, be sure there are no obstructions above or
around the display unit.
13.3

Installation or Transducers

13.3.1

How to mount a transducer through the hull

Transducer mounting location
The thru-hull mount transducer provides the best performance of all, since the trans-
ducer protrudes from the hull and the effect of air bubbles and turbulence near the hull
skin is reduced. If your boat has a keel, the transducer should be at least 30 cm away
from it.
The performance of this fish finder is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping the length of the transducer cable and the following factors in mind:
• Air bubbles and turbulence caused by movement of the boat seriously degrade the
sounding capability of the transducer. The transducer should, therefore, be located
13-2
Gasket (reddish brown)
Washer
Clamp nut
Center pin (soldered)
Shield
Connector shell