Instalation Overview; Selection Of Installation Site For Transducer - Furuno CI-88 Installation Manual

1. INSTALATION OVERVIEW

The Doppler Sonar Current Indicator CI-88 consist of a monitor unit (not available for black
box type), a transceiver unit, junction box and transducer (hull unit). To obtain absolute tide
even in deep waters, the CI-88 must be supplied with speed/course data (or position data)
from navigation equipment (GPS) and heading data from a gyrocompass (via an A-D
converter). The equipment can output ship's speed and true bearing data to a radar or
scanning sonar for true-motion display. Further, current data can be output to an echo
sounder or scanning sonar in CIF format.
To obtain full performance from the equipment, the installation of the units, especially the
hull unit, is very important. Poor siting of units or poor cable layout may cause pick-up of
noise, or give interference to other units. This chapter presents an overview of how to install
the equipment.
1.1

Selection of Installation Site for Transducer

The performance of the equipment largely depends on the installation of the transducer unit,
and a very important consideration is the installation site. Is should meet the following
requirements.
a) No projections (such as sonar's retraction tank) should exist in the hatched area shown
below. However, when the transducer projects below the lowest part of the keel, the
effects when the sonar transducer is lowered must be taken into account.
Keel
Cross Section View
Transducer
45
Keel
Transducer
Transducer, mounting location
80
50
50
80
Hull Unit
(Transducer)
Bow
Hull Unit Projecting Distance
Bow
1-1