Avidyne IFD540 Pilot's Manual page 118

Fuel Planner
The fuel planner includes fields for the type, origin, destination,
ground speed, fuel on board, and fuel flow, and will produce a
computed fuel at destination value.
The "Type" field choices are "Present Position" or "Point-to-Point".
Fuel Planning Calculator
Trip Planner
The trip planner includes fields for type, destination, ground
speed, departure time and departure date and will produce values
for desired track, distance, ETE, ETA, sunrise and sunset, and
enroute safe altitude (ESA) - defined as 1000' above the
maximum elevation of terrain (but not obstacles) within a
rectangular grid that measures 10 miles on each side of the
centerline of the leg and extends between the origin and
destination that was entered into the calculator.
The "Type" field choices are "Present Position" or "Point-to-Point".
If Point-to-Point was selected, then there is also a field for origin.
Trip Planner Calculator
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