Humminbird TFXIDD Owner's Manual

TFXIDD

In-Dash

Digital Depth Gauge

operations manual

Warning! This device should not be used as
a navigational aid to prevent collision,
grounding, boat damage or personal injury.
When the boat is moving, water depth may
change too quickly to allow time for you to
react. Always operate the boat at very slow
speeds if you suspect shallow water or
submerged objects.

Section 1: GENERAL INFORMATION . . . . . . . . . . . . . . . 2

How Sonar Works. . . . . . . . . . . . . . . . . . . . . . . . . 2

Section 2: USING THE DIGITAL DEPTH GAUGE . . . . . . . 4

What you see on-screen . . . . . . . . . . . . . . . . . . . . 4

Control functions . . . . . . . . . . . . . . . . . . . . . . . . . 4

Shallow Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Deep Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Keel Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Section 3: MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 9

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 10

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 12

TABLE OF CONTENTS

REV 10201E

2

GENERAL INFORMATION

HOW SONAR WORKS

HOW SONAR WORKS

Sonar uses sound waves to determine the
presence and location of underwater objects.
The time measured between the transmission of
the sound wave, and the reception of any
reflection can be used to determine distance.

Analysis of the reflected signal can also

be use to determine location, size,

composition, etc.

Digital depth

gauges consist of

two primary com-

ponents: the sonar

unit and the

transducer. The

sonar unit contains

the transmitter

and receiver, as

well as the user

controls and display.

The transducer is mounted

beneath the water surface and

converts electrical energy from the trans­mitter into mechanical pulses or sound waves.
The transducer also receives the reflected sound
waves and converts them back into electrical
signals for display on the sonar unit.

3

The transmit and receive cycle is very fast. A
sound wave can travel from the surface to a
depth of 240' and back again in less than

¹⁄₄ of
a second; so it is unlikely that your boat can
“outrun” this sonar signal.

As the digital depth gauge transducer receives
sonar signals, it converts them to a digital
depth that is displayed on your digital depth
gauge. The depth reading is continuously
updated as you travel across the water.

Easy-to-use controls on the digital depth gauge
allow you to set the SHALLOW ALARM or DEEP
ALARM for an audible alert when the boat is in
extreme shallow or deep water.

The liquid crystal display (LCD) offers sharp
viewing, even in bright direct sunlight, and is
continuously lit for nighttime operation.

NOTE: Actual depth capability depends on such
factors as bottom hardness, water conditions, and
transducer installation. Units will typically read to
deeper depths in fresh water than in salt water.

GENERAL INFORMATION

HOW SONAR WORKS