Garmin Software Version 0369.13 Betriebsanweisung PDF herunterladen (Seite 155)

Garmin G1000 Cockpit Reference Guide for the DA40/40F

190-00324-07 Rev. A

SECTION 11 – ABNORMAL

OPERATION

11-3

11.6 DEAD RECKONING

While in Enroute or Oceanic phase of ﬂight, if the

G1000 detects an invalid GPS solution or is unable to

calculate a GPS position, the system will automatically

revert to Dead Reckoning (DR) Mode. In DR Mode,

the G1000 uses its last-known position combined with

continuously updated airspeed and heading data (when

available) to calculate and display the aircraft’s current

estimated position.

NOTE: Dead Reckoning Mode will only function in

Enroute (ENR) or Oceanic (OCN) phase of ﬂight.

In all other phases, an invalid GPS solution will

produce a ‘NO GPS POSITION’ annunciation on

the map and the G1000 will stop navigating in

GPS Mode.

DR Mode is indicated on the G1000 by the appearance

of the letters ‘DR’ superimposed in yellow over the ‘own

aircraft’ symbol as shown in Figure 11-4. In addition, ‘DR’

will be prominently displayed, also in yellow, on the HSI

slightly above and to the right of the aircraft symbol on the

CDI as shown in Figure 11-4. Also, the CDI deviation bar

is removed from the display. Lastly, but at the same time, a

‘GPS NAV LOST’ alert message will appear on the PFD.

Normal navigation using GPS/WAAS source data

will resume automatically once a valid GPS solution is

restored.

It is important to note that estimated navigation

data supplied by the G1000 in DR Mode may become

increasingly unreliable and must not be used as a sole

means of navigation. If while in DR Mode airspeed and/or

heading data is also lost or not available, the DR function

may not be capable of accurately tracking your estimated

position and, consequently, the system may display a path

that is different than the actual movement of the aircraft.

Estimated position information displayed by the G1000

through DR while there is no heading and/or airspeed

data available should not be used for navigation.

DR Mode is inherently less accurate than the

standard GPS/WAAS Mode due to the lack of satellite

measurements needed to determine a position. Changes

in wind speed and/or wind direction will compound the

relative inaccuracy of DR Mode. Because of this degraded

accuracy, the crew must maintain position awareness using

other navigation equipment until GPS-derived position

data is restored.

Figure 11-4 Dead Reckoning Indications

Symbolic Aircraft

(Map pages and Inset Map)

CDI ‘DR’ Indication on PFD

As a result of operating in DR Mode, all GPS-derived

data will be computed based upon an estimated position

and will be displayed as yellow text on the display to

denote degraded navigation source information. This

data includes the following:

• Navigation Status Box ﬁelds except Active Leg, TAS,

and DTK

• GPS Bearing Pointer

• Wind data and pointers in the Wind Data Box on

the PFD and MFD

• Track Bug

• All Bearing Pointer Distances

• Active Flight Plan distances, bearings, and ETE

values

Also, while the G1000 is in DR Mode, the autopilot will

not couple to GPS, and both TAWS and Terrain Proximity

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