8-19
Pilots will find the GPS 95's vertical
navigation (VNAV) function useful for
calculating vertical speed
requirements. In order to use the
VNAV feature, aircraft ground speed
must be greater than 35 knots.
To calculate vertical speed requirements...
· Place the cursor on the initial (Frm) altitude field.
· Enter the initial altitude and press ENT.
· Enter the final (To) altitude and press ENT.
· Enter the offset distance, from the desired waypoint, at which you will
reach your final altitude. Press ENT.
· Select “Before” if the offset is before the waypoint, or “After” if the offset
is beyond the waypoint, by pressing CLR.
· If an active route is being used: press CLR to select the route waypoint
to which the offset applies.
· You now have defined how far before, or after, the indicated waypoint
you wish to be at the final altitude. The GPS 95 will display the required
vertical speed.
To activate the VNAV function...
· Review the calculated vertical speed. If you wish to change the vertical
speed: place the cursor on the vertical speed (At) field, enter the
desired vertical speed and press ENT.
· Place the cursor over the “VN” field.
· Press CLR to turn the VNAV function on. The VNAV status on the
bottom line will change from “Enter VNAV Profile” to “Begin at _____”
(with the blank indicating how long before the maneuver should begin),
or “Navigating” if the VNAV maneuver is already in progress. You will
be informed with the message “Start Altitude Change” when you are
less than 15 seconds from the point at which the VNAV maneuver is
to begin.
