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The Head-Up Display is overlaid on the 3-D display and shows the following data:-

When your sub is not at a high nose-up or nose-down angle, you will be able to see
the artificial horizon bar. This is displayed on the HUD as a short red line,
allowing you to see if your sub is in a level attitude.

When you reach a waypoint, it will be displayed on your HUD as a green triangle.
If you fly through the centre of this triangle, your sub’s navigation system will
automatically switch to track the next mission waypoint.

Thermal layers are boundaries between warm and cool water which are set up by
ocean currents. They are very important to sub pilots because they reflect sonar
just like a mirror reflects light. If you position your sub with a thermal layer
between it and the enemy, you will be invisible to their sonar.

Thermal layer boundaries may be one of two types:-
From warm to cool water - displayed on your HUD as a green grid.
From cool to warm water - displayed on your HUD as a red grid.

Thermal layers are also useful to orientate yourself. For example, if you are
upside-down you will see red thermal layers below you.

Thermal
Layer

Waypoint

marker

Targeted
object

Artificial

Horizon

SW Eng GP man  11/12/97 10:31 am  Page 20