T-45A UJPT & E2-C2 INav-05
TACAN/VOR Navigation Procedures, TACAN/VOR Holding
4. Performing a ground speed check
NOTE: For a reliable ground speed check, the DME
from the station should be greater than aircraft altitude
in thousands of feet.
EXAMPLE: Altitude is 30,000 ft (FL 300), so DME
should be 30 nm or greater.
a. Start timing when DME indicator displays a whole
number
b. After predetermined time (in minutes), check and
note DME
c. Determine distance flown and multiply that number
by multiplier corresponding to time flown
EXAMPLE: Your distance flown is 6 on the DME
indicator. The elapsed time is 1 minute, so 6 times
60 equals 360. Ground speed is 360 kt (6 nm/min
times 60 min/hr equals
360 nm/hr).
NOTE: Track either inbound or outbound on a given
radial when making a ground speed check.
NOTE: Every 1/10 nm equals 6 kt.
NOTE: Checking ground speed for more than 1
minute increases the accuracy of this method.
5. Proceeding direct between TACAN fixes (point to point)
a. Tune and identify station if not already done
b. Visualize compass card as compass rose with
station at center
c. Picture fix having greater distance from station on its
radial at outside edge of compass card
d. Visualize second fix at proportional distance from
center of compass card on its radial
(6-99) Original
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