Dead Reckoning - Garmin GTN 725 Pilot's Manual

1.10
Foreword
Dead reckoning is a feature that enables the GTN to provide limited navi-
Getting
gation using the last known position and speed after a loss of GPS navigation
Started
while on an active flight plan.
Audio &
Xpdr Ctrl
CAUTION: Navigation using dead reckoning is only an estimate and
should not be used as the sole means of navigation. Use other means of
Com/Nav
navigation, if possible.
FPL
Dead reckoning becomes active after a loss of GPS position while navigating
using an active flight plan and the flight phase is either En Route (ENR) or
Direct-To
Oceanic (OCN).
"DR" will be overlayed on the ownship icon. The To/From flag is removed
Proc
from the CDI. The Dead Reckoning annunciator (DR) appears on the lower
left side of the map display and will replace ENR or OCN when a GPS position
Charts
is unavailable and the unit is in Dead Reckoning mode. All external outputs
Wpt Info
dependent on GPS position are flagged.
Terrain will be noted as not available and new terrain advisory pop-ups will
Map
not occur. Traffic and StormScope information will not be shown on the Map
page, but will continue to be available on their own dedicated pages. XM weather
Traffic
will still be available on the Map page.
Terrain
Dead Reckoning mode will continue until GPS position is restored, when GPS
navigation is restored Dead Reckoning mode is exited. The DR annunciations
Weather
will be removed and GPS information will be used to compute navigation related
information for the current flight phase.
Nearest
Dead Reckoning is only allowed in En Route and Oceanic phases of flight.
Services/
If the unit is in a Terminal or Approach phase of flight when Dead Reckoning
Music
takes place, "No GPS Position" will be displayed on the map pages and all
navigation data will be dashed. If you are operating in Dead Reckoning mode
Utilities
and a transition to Terminal or Approach phases of flight would occur from the
System
projected Dead Reckoning position, Dead Reckoning mode will be discontinued.
"No GPS Position" will be displayed on the map pages and all navigation data
Messages
will be dashed.
Symbols
Appendix
1-20
Index

Dead Reckoning

Garmin GTN 725/750 Pilot's Guide 190-01007-03 Rev. D