User Guide

17-24

Navigation System

The table below breaks down how to use your navigation system. The first column lists the

objective (what you want to do). The second column shows the settings for various switches and

knobs. The third column shows the effects on these settings on the HSI (if any). The fourth column

shows the effects of the same settings on the ADI (if any).

The navigation system in your F-16 is composed of many interconnected parts: the mission

computer, the TACAN channel selector, the HSI, the ADI, etc. Essentially, navigation data comes

from either the mission computer or the TACAN system. Which data source depends on a number

of different switches and settings. The navigation data ends up on the HSI and the ADI.

In the table below, the first four examples use the NAV mode for navigation. The Nav system is the

part of the mission computer that remembers steerpoints and markpoints. Use the ICP to select

your destination and set the Instr Mode selector switch to either NAV or NAV/ILS.

The remaining examples use the TACAN system for navigation. The TACAN system consists of

the TACAN channel selector, the TACAN function knob and part of the mission computer. At the

start of Campaign and Tactical Engagement missions, the mission computer looks up and stores

the associated TACAN channels for any landing and refueling steerpoints.

The TACAN channel selector lets the pilot input navigation data manually.

The TACAN function knob determines whether the TACAN signal is coming from a tanker (AA-TR)

or an airbase (TR).

The CNI switch determines whether the TACAN signal comes from the mission computer (UFC) or

the TACAN channel selector (Backup).

The ILS bars on the ADI only function when the Instr Mode selector switch is set to either

NAV/ILS or TCN/ILS.

Objective Settings HSI ADI

Fly to a steerpoint Set ICP to STPT

Set CNI switch to UFC

Set Instr Mode selector switch to NAV