Garmin GPS 95 STD Personal Navigator Owner's Manual page 73

When VNAV is active, this page will recommend the altitude and vertical
speed required to complete the maneuver. Remember that these are only
recommendations. You will be informed with the message "Final Altitude
Alert" when the recommended altitude is within 1000 feet of the final altitude.
The VNAV function will be cancelled automatically if the active route (or
GOTO) is changed in any way (e.g., setting a new GOTO destination or
adding a waypoint to a route). You will be informed with the message "VNAV
Cancelled" if this occurs. If the aircraft ground speed does not exceed 35
knots, or a route waypoint that has already been passed is selected, the GPS
95 will display an "Invalid profile" status on the bottom line. The GPS 95 will
display "No Active Waypoint" on the bottom line if no route, or GOTO
destination, has been activated.
WARNING: Altitude and climb rate should be controlled only by the pilot in
command with due regard for airspeed and other aircraft performance
limitations.
8-20