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Compass and Attitude Indicator
The Compass Instrument displays a variety of information, including the heading of the ROV, the Auto Heading
status, an artificial horizon to indicate the attitude of the ROV, and the horizontal thruster settings. The Compass
Instrument is also used to engage and set Auto Heading.
Display
Use
The central portion of the Compass displays the heading of the ROV. It uses a "heading up" display so that the
heading of the ROV is always displayed under the reference indicator at the top center of the compass dial. For
example, if the ROV is heading NW, the North arrow will be rotated to the right. The heading in degrees
clockwise from North is also listed at the center of the dial.
The Auto Heading control/indicator is around the perimeter of the Compass. Auto Heading can be used to make
the ROV maintain its current heading, or turn to a user specified heading. See the
Operations Guide
for details on using Auto Heading.
The blue and green ring around the Compass/Auto Heading is the Attitude Indicator, which acts like an artificial
horizon. It indicates the pitch and roll of the ROV. The horizon is represented by the horizontal interface line
between the top blue section (sky) and the bottom green section (earth). When the ROV pitches down to a nose
low attitude, the amount of green increases and the interface line moves up within the circle. The reverse is true
when the ROV pitches up. When the ROV rolls to the starboard (right), the interface line rotates to the left
indicating that the starboard side is closer to the sea floor. The reverse is true when the ROV rolls to the port
(left).
The outer bands on the left and right of the Compass are the horizontal thrusters settings indicators. The left side
displays the port thruster setting, and the right side displays the starboard thruster setting. When there is no thrust
applied, these indicators become transparent. When thrust is applied a green shaded section appears within the
bands. The length of the green shading from the horizontal centerline indicates the amount of user input applied
for that thruster. Forward thrust is indicated by a green shading above the horizontal centerline. Reverse thrust is
indicated by a green shading below the horizontal centerline.
The size and display of the Compass can be adjusted for more information. See the
guide for more information.
The feedback of the thrusters settings is based upon the status of the hand controller input, not the thruster
action.
Compass Rose
Auto Heading Control/Indicator
Artificial Horizon
Thruster Settings Indicators
99
Auto Heading
section of the
Instruments
section of this
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