User Guide

If for example the thermal layer is at 350 feet and you are above that depth, you may have

difficulty detecting objects below 350 feet.Any enemy sub lurking below the layer may also have

difficulty detecting your ship.

The Sound Speed Profile is created from information returned from an Expendable

Bathythermograph (XBT) probe.When launched, this probe reports depth,temperature and sound

speed information in both graph and table form. Steps for generating a Sound Speed Profile are the

same on all controllable subs.

LAUNCHING AN XBT PROBE

When you enter the SSP station the last received results are available.These steps clear the

existing profile and initiates a new XBT reading.

Seawolf:

• Click

LAUNCH

in the button matrix.The layer depth is reported in the Data Display area above the

button matrix.

• To change the range seen in the graph, click

CHANGE DEPTH SCALE

, click the desired number

then click

BACK

688(I):

• Click

XBT

.The layer depth is noted at the bottom of the clipboard.You cannot adjust the depth

scale on the 688(I)s.

Akula:

• Click

XBT

.The layer depth is noted at the bottom of the notepad.

• To change the depth scale in use on the graph, click the desired number in the Depth Scale

Panel.

Updated information does not appear instantly on the screen.The XBT probe rises to the surface

and then descends before it begins reporting.This may result in a delay before the SSP updates.

NOTE:

Due to varying water temperatures at locations around the world, a distinct thermal layer is

not always present.

SEAWOLF: SSP STATION

Sound Speed Profile:

Displays in graph and table format the temperatures and speed data for the

area around Ownship.This data is not updated automatically.You must launch a new probe to get

updated information.

Sound Speed Profile Display

Data Display

Button Matrix

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