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REFERENCE
Within one minute of the
initial descent point, an
‘Approaching VNAV Profile’
message will appear.
Once you are within 500
feet of the target altitude,
the ‘Approaching Target’
message will appear, and
the VNAV indicator will be
removed from the HSI
display.
85
VERTICAL NAVIGATION (cont.)
With the VNAV profile set, the HSI page will guide you through the
maneuver. Data fields on the HSI page will indicate time to
beginning of maneuver, time to target altitude and vertical speed to
target. A VNAV indicator on the HSI display will guide you along the
proper descent angle. Expect the following to occur when using the
vertical navigation feature:
• As you approach the initial descent point, the estimated time to
VNAV profile (ETV) field indicates the time to reach the initial
descent point.
• At one minute before you reach the initial descent point, a
message, ‘Approaching VNAV Profile’, occurs. The estimated
time to VNAV profile (ETV) will sequence from indicating time to
initial descent point to indicating time to reach target altitude.
Finally, the descent angle will lock to prevent changes in ground
speed from altering the profile.
• At 500 feet above the target altitude, an ‘Approaching Target
Altitude’ message is provided. The estimated time to target (ETV)
figure will go blank and the VNAV indicator will disappear from
the HSI display.
WARNING: GPS accuracy may be degraded by the U.S. Department of
Defense-imposed Selective Availability (SA) program. With SA on, GPS alti-
tude may be in error by several hundred feet or more. Errors of this magnitude
may result in fluctuations in the VNAV indicator on the HSI page. The
GPSMAP 195 is a VFR navigation tool and should not be used to perform
instrument approaches.
VNAV Indicator
!
Main Menu: VNAV
gps 195 manual C 7/1/99 4:49 PM Page 85