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1. INTRODUCTION
1-6
1.5 How to Select a Tracking Mode
Press the TRKG MODE key (main display unit) or the MODE key (Remote Controller)
to select a tracking mode, among ground, water and auto. Select the mode according
to the depth and speed. The tracking mode indication, Ground, Water, or (Auto),
appears at the top-right corner.
The tracking mode monitor (bar) at the top of the display shows the history of tracking
modes for the past three minutes. The bar is updated every three seconds and scrolls
leftward. The color of the bar is green for ground tracking, blue for water tracking, and
background color when there is no echo input.
Description of tracking modes
Ground: Measure and display a
speed relative to the sea bottom. The
depth from the keel must be 1-200 m
to use this mode.
Water: Measure and display a speed
relative to the watermass. The depth
from the keel must be at least three
meters to use this mode. However,
the accuracy is lower when the clear-
ance is less than 40 m.
The reference layer can be set with
[Track Depth] on the [System menu].
See section 5.7.
Auto: Automatically selects ground tracking mode or water tracking mode according
to the depth. The water tracking mode is selected when the keel clearance is 200 m
or more. (Actual working depth in the ground tracking mode depends on the bottom
and water conditions, and the reflection properties for sonic pulses.)
A
Tracking mode monitor ( )
(History of tracking mode in last 3 min.)
Green: ground tracking
Blue: water tracking
Background color: no echo
- Ground
- Water
- (Auto)
Tracking mode
56.0
Water tracking speed
reference layer
In the ground tracking mode, the bottom is
used as reference to calculate movement.
Ground
tracking
speed
(depth 1-200 m)
Water tracking
speed