Avidyne IFD540 Pilot's Manual page 86

If the intended new waypoint is not listed in the dialog box to your
satisfaction, press the bezel "CLR" button to clear and restart as
required.
As soon as a fix from the presented list is selected, a new
waypoint is inserted in the FPL flight plan list and uses a default
waypoint naming mechanism ("RBxxx" where "RB" stands for
Rubber Banding). This can easily be seen if the IFD were on the
FPL tab of the FMS page and using the split Map-FPL view.
TIPS AND TECHNIQUES
Optimal Rubber Banding
If you don't see the desired leg turn cyan within 2
seconds of placement of your finger on the location,
try slightly adjusting the placement of the finger that
is being used to designate a leg for rubber banding.
Move your finger slightly in a direction perpendicular
to the leg. Note that the active leg (the magenta
one) of a flight plan cannot be rubber-banded.
Rubber banding is a handy feature to quickly alter a flight plan
around airspace or a weather buildup while staying on the map.
NOTE
Rubber Banding Only Via Touch
Rubber banding can only be accomplished via touch
screen controls. There is no physical bezel control
to support the feature.
3-10 Map Pages