3.1 OVERVIEW

The NAV/COM frequency controls and windows are located in the top corners of the Primary Flight Display (PFD) and Multi Function Display (MFD). The NAV controls and NAV frequency window are located on the left side, the COM controls and COM frequency window are on the right. The DME Tuning window is located in the lower right corner on the PFD, as shown in the figure below.

NAV	NAV Frequency Window
Controls

NAV/COM

The NAV/COM interface includes:

•Windows and fields

•Radio selection

•Tuning boxes

•Frequency Transfer Arrows

•Radio status indications

•Controls

					COM
	COM Frequency Window				Controls

Figure 3-1 G1000 NAV/COM Interface (PFD)	DME Tuning Window

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Garmin G1000 Pilot’s Guide for Cessna Nav III

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NAV/COM

WINDOWS AND FIELDS

The NAV and COM Frequency windows are located at the top of the display on either side of the Navigation Status bar on both the PFD and the MFD.

•TheNAV Frequencywindowisdisplayedtotheleft of the Navigation Status bar.

•The COM Frequency window is displayed to the right of the Navigation Status bar.

Each radio frequency window is composed of two fields, a standby field and an active field.

•IntheNAVFrequencywindow,theactivefrequency is on the right side, the standby frequency is on the left.

•IntheCOMFrequencywindow,theactivefrequency is on the left side, the standby frequency is on the right.

RADIO SELECTION

Frequencies in the active window are displayed in either green or white.

•An active COM frequency is displayed in green indicating that the COM radio is selected on the audio panel (COM1 MIC or COM2 MIC keys). White numbers indicate that the radio is not selected.

•An active NAV frequency is displayed in green indicating the NAV radio is selected for navigation on the HSI. NAV radio selection is made with the PFD CDI softkey.

•NAV1 selected: a single green arrow with ‘VOR1’ or ‘LOC1’ displayed on the HSI.

•NAV2 selected: a double green arrow with ‘VOR2’ or ‘LOC2’ displayed on the HSI.

•Both active NAV frequencies displayed in white indicate that GPS is in use.

Standby NAV				Selected NAV			Selected COM	Standby COM
Frequency Field				Radio	Navigation Status Bar		Radio	Frequency Field

Tuning Box	Active NAV	Figure 3-2 Frequency Fields	Active COM	Tuning Box
	Frequency Field		Frequency Field

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Garmin G1000 Pilot’s Guide for Cessna Nav III

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CONTROLS

The NAV Frequency window is controlled by knobs and keys on the left, the COM Frequency window by knobs and keys on the right.

The NAV controls:

•VOL/PUSH ID knob

–Turn to adjust the NAV radio volume level.

–Press to turn the Morse code ID ON and OFF.

•Frequency Transfer key

–Press to transfer the NAV frequencies between the active and standby fields.

•Dual NAV tuning knob

–Turn to tune a NAV frequency in the NAV tuning box (large knob for MHz; small knob for kHz).

–Press to transfer the NAV tuning box between the NAV1 and NAV2 radios.

NAV/COM

The COM controls:

•VOL/PUSH SQ knob

–Turn to adjust the COM radio volume.

–Press to turn automatic squelch ON and OFF.

•Frequency Transfer key

–PresstotransfertheCOMfrequenciesbetween the active and standby fields.

–Press and hold for two seconds to tune the emergency frequency (121.500 MHz) in the active COM field.

•Dual COM tuning knob

–Turn to tune a COM frequency in the COM tuning box (large knob for MHz; small knob for kHz).

–Pressto transfer the COM tuning box between the COM1 and COM2 radios.

NAV Controls

COM Controls

VOL/PUSH

VOL/PUSH

ID Knob

SQ Knob

Frequency Transfer Keys

Dual NAV

Dual COM

Knob

Knob

•Turn to tune desired frequencies.

•Press to change tuning box positions.

Figure 3-3 NAV/COM Controls

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Garmin G1000 Pilot’s Guide for Cessna Nav III

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NAV/COM

TUNING BOX

A light blue tuning box is displayed around the radio standby frequency window, on both the PFD and MFD. Pressing the small COMor NAVknob transfers the tuning box back and forth between the two windows.

Frequencies located in the standby window are displayed in either white.

Frequency Transfer Arrow				Tuning Box

Figure 3-4 Frequency Transfer Arrow and Tuning Box

SWITCHING BETWEEN RADIOS

Pressing the small COM or NAV knob transfers the tuning box between the radio frequency windows.

When a different COM transceiver is selected on the audio panel, the COM frequency tuning box highlights the frequency on both the PFD and MFD.

When a different NAV radio is selected on the HSI, the NAV frequency tuning box highlights the frequency on the PFD and MFD. The NAV frequency tuning box does not change when GPS mode is selected.

Pushing the small COM knob switches the tuning box from one COM radio to the other.

Figure 3-5 Switching COM Radios

Pushing the small NAV knob switches the tuning box from one NAV radio to the other.

Figure 3-6 Switching NAV Radios

MANUALLY TUNING A FREQUENCY

The dual COM and dual NAV frequency knobs are used for manual COM and NAV radio tuning. The frequencies are tuned in the standby field.

•The MHz frequency digits are tuned with the large COM and NAV knobs.

•The kHz frequency digits are tuned with the small COM and NAV knobs.

Turning the knobs clockwise increases frequency. Turning the knobs counterclockwise decreases frequency.

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Garmin G1000 Pilot’s Guide for Cessna Nav III

190-00498-00 Rev.A