Garmin GTN 625 Pilot's Manual page 187

Fuel Range Ring
NOTE: This feature is available in software version 6.00 and later.
When interfaced with a fuel computer, the GTN can display a fuel range ring
which shows an estimate of the remaining flight distance at the current fuel
consumption rate and groundspeed. If either fuel quantity or fuel flow sensor
data is not received, the GTN will use the Fuel on Board or Fuel Flow values
on the Utilities – Fuel Planning page. If both fuel quantity and fuel flow are not
received by the GTN, the Fuel Range Ring will be removed. A dashed green
circle indicates the selected range to reserve fuel. A solid yellow circle indicates
the total endurance range.
190-01004-03 Rev. K
Figure 8-17 Fuel Range Ring
Garmin GTN 625/635/650 Pilot's Guide
Total Endurance Range
Total Endurance Time
Time To Reserve Fuel
Range To Reserve Fuel
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