Avidyne IFD550 Pilot's Manual page 154

IFD500 Series Pilot Guide
Each Nearest type list can be scrolled either via touch (use a
vertical swipe of the finger) or via the bottom right knob.
If the highlighted item is an airport, pressing the Direct-To key on
the bezel will display the Direct-To green dialog box with the
highlighted airport pre-populated as the Direct-To location.
Pressing the NRST key will bring up the Nearest tab in the split
Map-Nearest view. Each subsequent push of the "NRST" key will
step to the next nearest data type.
If the Nearest page is left for 60 seconds or more and then is
returned to, the Nearest Airports selection will be the active
nearest data type no matter what the last nearest data type may
have been. For example, if the Nearest VORs selection was the
most recent display of nearest data, and then the pilot selects a
map page for more than 60 seconds, when the Nearest tab is
next selected, Nearest Airports data is now displayed and not
Nearest VORs.
TIPS AND TECHNIQUES
Emergency Return to Departure Airfield
If on departure leg and an emergency return to the
departure airfield is deemed necessary, the
recommended technique is to press the –D-> button
on the bezel, turn the bottom right knob counter-
clockwise to pre-fill the departure airfield and press
ENTR, ENTR to make that the active waypoint.
Then press the PROC key to produce a dropdown
list of approaches and select the desired one. To
quickly get the tower frequency of that airfield, press
the NRST button on the bezel and confirm the
departure airfield is the highlighted row. You can
then press the bottom right knob to nominate that
frequency into the standby slot for swapping.†
3-64 FMS Subsystem