APPLICATIONS
Section 3
72
TIMEWISE 798A
Step by Step
Critique
When you arrive at the start of the rally, set the 798A clock to the official time and follow
the procedures detailed earlier in
At the Start of a Rally
.
Assuming that you’re going to use the
Compute Factor
feature, enter 13.19 as the
Odo Check
mileage. Make sure you reset the main odometer to 0.00 and that you use a
CAST of 0.0 during the odometer check (so you drive the odometer check as a transit zone).
0.00
1.
Start odometer check at “SPEED LIMIT 25”. Complete route instruction 4 at 10:40 AM plus
your car number in minutes.
Leave the start at 10:12 AM (or earlier, if permitted), placing the 798A in
FORWARD
at the
“SPEED LIMIT 25” sign. Proceed along the course, comparing the odometer to the
reference mileages given in route instructions 2 and 3. Do not correct the main odometer at
these references! During the transit, set the next CAST (39) into the
NEXT SPEED
display.
13.19/0.00 4. End odometer check at “STOP AHEAD”. CAST 39.
At “STOP AHEAD” the odometer reads 13.56 miles. When you execute
Co m p u t e Fa c t o r
,
your new factor is 062302. Write this number down!
Your out-time from this point is 10:52 AM. Enter this time into the
CA L CU L A T E D T I M E
display. Then actuate
CAST
to change to the speed used for the first speed section (39).
Preset the next CAST (30) into the
NEXT SPEED
display.
5. Leave the main road. CAST 30.
After a short distance, you come to a sideroad. Since the main road goes straight here, you
turn down the sideroad and simultaneously actuate
CAST
to change the CAST to 30.
Preset the next CAST (36) into the
NEXT SPEED
display.
Suddenly, the road surface turns to gravel. Actuate
CAST
immediately and adjust the active
CAST to 25 (from the value 36 now showing in the
SPEED
display) by using the
Sp e e d
function. By adjusting the active CAST, the calculated time from where the road changed to
gravel (where you executed the CAST) will be corrected. This is a retroactive CAST change.
When the road surface changes back to paved, actuate
CA S T
again and confirm that the
active CAST is 30 (the CAST prior to entering the gravel road).
5.69
6. CAST 36 at tee.
At the tee, CAST. Then select
L A S T CA S T
. Let’s assume your actual odometer measure-
ment at the tee was 5.72 miles.
To align the odometer and calculated time to official course values, select
L A S T CA S T
and
change the last CAST odometer measurement to 5.69 by subtracting .03 miles. The corrected
distance for the last speed section will be shown in the
AUXILIARY
display. Then select
Adjust ORM
and subtract 0.03 miles from the odometer. This corrects the overall distance.
Note, however, that the 0.03 mile error may have occurred because of wheel slippage while
on the gravel road. For better accuracy, you can use the
Odo & Time
function, instead of
the
Adjust ORM
function, setting the calculation speed to the CAST used on gravel (25
mph). To do so, select
Odo & Time
, subtract the .03 miles from the odometer, select
Calc Speed
(depress
SHIFT
) and set the calculation speed (showing in the
SPEED
display)
to 25. Then turn the rotary switch away from the
Odo & Time
position. (You can adjust the
calculation speed before or after you enter the
Odo & Time
mileage correction.)
Preset the next CAST (30) into the
NEXT SPEED
display.
