User Guide

■ A tracker letter is placed above the contact line on Seawolf and 688(I) or below the spike on

Akula. Four trackers are available for each sonar array.

A, B, C, and D:

Spherical/cylindrical contacts.

E, F, G, and H:

Hull/conformal contacts. (These trackers can only be assigned in Narrowband on the

Seawolf and 688(I) submarines. On the Akula they can be assigned in both broadband and

Narrowband.)

I, J, K, AND L:

Towed array contacts.

■ If the sphere/cylindrical array already has four contacts assigned to trackers (A-D) and you

designate a new contact, the oldest tracker is unassigned from its current contact and

reassigned to the new contact.This is also true for the hull and towed arrays.To unassign a

specific tracker, click on the letter and drag it into the Display and release it.

■ Each contact you designate is assigned a sequential Sierra number: S01,S02, S03, etc.The

Sierra number, also called a Contact ID or Track ID, and all available data on the contact are

automatically sent to TMA and the Nav map.

TOWED ARRAY CONTACTS

Unless the towed array is deployed, no contacts will appear in Display when that sensor is

selected.Towed array contacts do not appear immediately when you deploy the array. If the towed

array is not already deployed at the beginning of the mission, you can stream it from the Ship

Control Station.

Because of the way the towed array processes signals, an ambiguous contact,a mirror image of

each true contact, appears on the display along with the true contact. If you have a contact at the

same bearing on your bow array, you can be fairly certain a contact at the same or nearly the

same bearing on your towed array display is the contact’s true bearing.

If the contact is not visible on the bow array, changing the course of Ownship allows you to

determine which contact is the actual and which is its mirror image on the display.After you

maneuver, one contact remains at a consistent bearing and one appears to move in the display.

The contact’s true bearing is the contact that remains constant.

When numerous contacts are present or the contacts are close together, this process can be very

challenging!

NOTE:

Be aware that when you turn Ownship your towed array does not begin to turn until it

reaches the point in the ocean where the ship began its turn.As a result, Ownship appears

as a contact on the towed array during turns.

SEAWOLF:

BROADBAND STATION

Upper Waterfall Display

Lower Waterfall Display

Data Display

Button Matrix

Sonar Station Selection Buttons

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