Triton Isis Manual do Utilizador descarregar pdf (Página 155)

June 2004 Isis® Sonar User's Manual, Volume1

141

In the example shown in Figure 8-13, a percentage of

80 is being applied to an

incoming value of

94.00 m from the cable-counter data via the serial port.

Notes:

• Depth is no longer an option in this mode. Instead, the operator enters

an estimate of the percentage of cable out and clicks

Apply. Isis then

uses whatever value is present in the

Cable Out, Height of Towpoint

and

Offset text boxes and calculates the layback using the formula

shown in the dialog box.

• The

Current Value is the layback value that is being either recorded to

the .XTF file in Record Mode or applied to the position during Playback

Mode.

• Layback =

{(C-H) * P/100} + O

•

C = Cable out, H = Height of Towpoint, and P = Percentage

8.7.2 Positioning the Towfish Using Trackpoint

Trackpoint is an acoustic positioning system marketed by ORE Offshore.

Using an acoustic beacon attached to the towfish, Trackpoint can provide a

true position of the towfish relative to the vessel’s navigation antenna in X, Y

and Z dimensions. Isis provides a direct interface to this system via a serial

port (see

4.2, ‘Serial Port Setup’).

Setting up this input in serial port setup enables the recording of the

Trackpoint data into the

.XTF file. However, to actually apply the Trackpoint

offset information to the navigation antenna position, Trackpoint must be

enabled in the Layback Correction dialog box (Figure 8-14).

Chapter 8: Using the View Menu

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