Garmin G3X Installation Manual page 699

Reference Speeds–The aircraft Vspeeds can be entered using the Touch Screen or a Move Selector Knob.
A label can be added to the Custom (1-4) reference speed fields. The entered label text will be displayed
on the airspeed tape (in normal mode) at the entered speed. If no text is entered for the label, a small
triangle will appear instead.
The aircraft's maximum speed limit can be configured in three different ways. All aircraft have a maximum
indicated airspeed limit (VNE) which is configured using the VNE - Indicated field. This airspeed is
marked on the PFD airspeed tape with a red line, and does not change with altitude. In this example, the
value for VNE has been entered as 205 knots indicated airspeed. The aircraft is below the never-exceed
speed any time its indicated airspeed is below 205 knots.
190-01115-01 G3X/G3X Touch Install Manual - GDU 45X/46X Config and Post Install Checkout
Rev. AA Page 32-104