
6 – Operation software
DPN 402197 © TSS (International) Ltd Page 13 of 32
the circles shows the ahead direction of the ROV. Superimposed on this is a repre-
sentation of the cable G, showing its distance from the ROV and its relative heading.
The altitude, skew and distance to the target L are all shown at the top of the screen.
The “ALT” field gives the height (taking into account any offset) above the seabed as
measured by the subsea altimeter. If the system is configured to use a fixed coil
height, this value will be steady and reflect this value. The skew angle gives the differ-
ence in heading between the vehicle and the cable: a positive value indicates that the
ROV must be steered towards the port side to become perpendicular to the cable.
The distance to target (FWD) gives an approximate reading of the distance, in m,
between the ROV and cable, measured between a point directly below the ROV on
the seabed, and the point on the cable which is directly ahead of the ROV.
Vertical Display
The lower part of the screen shows the positions of the ROV, seabed and target in the
vertical direction. The process of estimating the forward range of the target requires
the System to assume that the target is uncovered and lying on the seabed. For this
reason, the target (represented by the grey cross G is always shown on top of the
line K representing the seabed. The vertical scale of this diagram M can be changed
using the “Toggle Height Scale” in the “View” menu, or the shortcut key [CTRL]-[H].
The distance to target is also shown on the graph as the line J. This distance is
always measured along the seabed, and is not the shortest distance from the ROV to
the target.
This window also displays the signal bars P and coil voltages O as shown on the
Run/ Display screen. However, the vertical and fore-aft coil voltages are displayed in
place of the vertical and lateral signal voltages. By observing these values (in particu-
lar the bargraph display), an experienced ROV pilot can detect and steer towards a
target before any other indication appears on the Forward Search display.
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