Citizen AD2992-59P User manual

English
Enhanced Features and
Functions Guide

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English
Enhanced Features and Functions Guide
This booklet contains instructions for using additional functions (mainly on the model
with the exterior rotating bezel). Use these instructions in addition to the instructions for
standard operation in the main operating manual. Some models have multiple functions.
There may be some discrepancy between the illustrations shown and the appearance of
your watch, however the method of operation will remain the same.
1. Tachymeter, speed calculation..................................... 4
2. Determining Compass Direction.................................. 5
3. Rotating Bezel, time calculation .................................. 6
4. Calculator Function ....................................................... 8
4-1. Simple Calculations............................................................................9
4-2. Calculator for Motor Sports...............................................................16
4-3. Calculator for Aviation......................................................................22
5. Yachting Functions ...................................................... 27
6. World Time.................................................................... 32
7. Terms for units indicated on slide rules and their
explanations ................................................................ 34
Contents

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English
1. How to use the Tachymeter
The most common use of a tachymeter is for
measuring the approximate speed of a
vehicle over a known distance.
e.g.) Based on how many seconds it takes a
vehicle to travel 1km or 1 mile (the available
measuring range is up to 60 seconds), the
average speed within the distance can be
calculated.
Start the chronograph when the vehicles commences travel.1)
After the vehicle has travelled 1 km/1mile, stop the chronograph.2)
The approximate average speed within the distance can be determined
by observing the present position of the second hand and reading the outer bezel.
Note: The tachymeter indications may appear on dial ring, rather than on the outer
bezel (depending on model).
As shown in the illustration, it takes the vehicle 45 seconds to travel 1km or 1mi so
the approximate average speed is 80kph (50 mph).
Second hand
2. How to use the watch as a Compass
(Northern Hemisphere for instance)
The approximate direction can be
determined by comparing the position of
the hour hand to the sun. Keep in mind
that these determinations are approximate
as there is some discrepancy at different
latitudes and in different seasons.
Lay the watch horizontally and align the hour
hand of the watch with the direction of the sun.
The middle point between the alignment of the
sun with the hour hand, and the 12 o’clock
position on the dial, approximately indicates
South.
Positioning the rotating bezel so that it points south, will then allow you to read other
approximate compass directions.
S
SE
E
NE
N
NW
W
SW
Twelve.
o’clock
South
Hour
Hands
North

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English
3. How to use the Rotating Bezel to
measure time
<To check the elapsed time>
Align the zero mark “1) ” of the
rotating bezel with the position of the
minute hand.
Then, read the scale above the rotating2)
bezel, to which the minute hand points
so as to gure out the elapsed time.
As shown in the illustration, the
elapsed time is 10 minutes. Minute hand
Time
elapsed
<To check the remaining time>
Set the “” mark to the scheduled time.
You can now see the amount of time that•
remains until the scheduled point.
Note: The rotating bezel of Divers
watches conforming to ISO or JIS
standards, can only be rotated
counterclockwise in order to
reduce the risk of error. Remaining
time
Minute hand

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English
4. How to use the calculator function
60
55
50
45
40
35
30
25
20
15
10
11
12
13
14
16
17
18
19
21
22
23
24
90
80
70
F
U
E
L
L
B
S
.
L
I
T
E
R
S
.
O
I
L
L
B
S
.
I
M
P
G
A
L
.
G
A
L
.
U
S
.
55
50
N
A
U
T
.
45
40
35
30
25
20
15
10
90
80
70
11
14
13
16
17
18
19
21
22
23
24
S
T
A
T
.
K
M
.
12
6
9 3
1:10
1:20
1:30
1:40
1:50
2:00
2:30
3:00
3:30
4:00
4:30
5:00
6:00
7:00
8:00
9:00
Note: In some models, the inner and outer scales are opposite. Be sure to make the
appropriate substitutions to the following instructions.
Simple Calculations4-1.
[How to do multiplication]
Q : 20 × 15
A : Adjust 20 of the outer scale until it points to 10 of the inner scale.
You can read the digit 30 from of the scale of the outer scale corresponding to 15 of
the inner scale and adding a unit, you can get the answer 300.

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English
[How to do division]
Q : 250 ÷ 20
A : Adjust 25 of the outer scale until it points to 20 of the inner scale.
You can read the digit 12.5 from of the scale of the outer scale corresponding to 10
of the inner scale and get the answer 12.5.
[How to calculate ratios]
Q : 30/20 = 60/A
A : Adjust 30 of the outer scale until it points to 20 of the inner scale.
You can read the digit 40 from of the scale of the inner scale corresponding to 60 of
the outer scale and on all the positions above the scale, the ratio between “inner and
outer” is the ratio between “30 and 20”. Therefore, you can determine the answers of
other ratios.

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English
[How to convert volume between different units of measurement]
You can convert fuel between Pounds (lbs), U.S Gallons, Imperial Gallons or Liters.
Q : How much is 13.1 lbs of fuel if
it is converted into U.S.Gallons,
Imperial Gallons and Litres
respectively?
(1 FUEL.LBS is 0.167
U.S.GAL / 0.139 IMP.GAL /
0.632 Liters)
A : Adjust the “” of FUEL.LBS.
of the outer scale until it points
to the digit 13.1, which you want to convert, of the inner scale.
Read the digit corresponding to the “” of U.S.GAL of the outer scale.
Adding a unit and you will get the answer which is 2.18 U.S.GAL.
Similarly, read the digit corresponding to the “” of IMP.GAL., LITERS., you can
get the answers, which are 1.82 IMP.GAL and 8.28 Liters.
[How to convert weight between the different units of measurement]
You can convert between Oil in Pounds to U.S. Gallons, Imperial Gallons or Liters.
Q : How much is 16.4 lbs of oil
converted into U.S. Gallons,
Imperial Gallons and Liters
respectively?
(1 OIL.LBS. is 0.133
U.S.GAL, 0.111 IMP.GAL
and 0.503 Liters)
A : Adjust the “” of OIL.LBS.
of the outer scale until it
points to the digit 16.4, which you want to convert, of the inner scale.
Read the digit corresponding to the “” of U.S.GAL of the outer scale. Adding a
unit and you will get the answer which is 2.18 U.S.GAL.
Similarly, read the digit corresponding to the “” of IMP. GAL., LITERS., you can
get the answers, which are 1.82 IMP. GAL and 8.25 Liters.

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English
[How to convert distance between the different units of measurement]
You can convert between Kilometers, Nautical Miles and Statute miles.
Q : How many Kilometers and Nautical Miles are equivalent to 1 Statute Mile?
A : Adjust the “” of 10 of the outer scale until it points to the “” of STAT of the
inner scale.
Result: Read 16 of the scale corresponding to the “” of KM of the inner scale.
Move the decimal point once, and you will get the answer which is 1.6km.
Similarly, you can get the answer 86.6 NAUT corresponding to the “” of NAUT.
[How to convert fuel between different units of measurement]
You can convert between Liters, US Gallons or Imperial Gallons.
Q : How many Liters are equivalent to 16.8 U.S Gallons?
A : Align the “” of U.S. GAL of the outer scale with the digit 16.8, which you want to
convert, of the inner scale.
Result: The converted value (about 63.5) corresponding to the “” of liter of the
outer scale can be determined.
(1 U.S. GAL = 3.78541 Liters)

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How to use the motor sports function4-2.
[Calculation of time needed to reach a set distance]
Q : How long does it take for a vehicle travelling at a speed of 80km to travel 400km?
A : Align 80 of the outer scale with the SPEED INDEX“” of the inner scale.
Result: 5 Hours (5.00) of the inner scale correspondes to 40 of the outer scale.
[Calculation of speed]
Q : What is the speed of a vehicle travelling a distance of 180km for period 2 hours
and 30 minutes?
A : Align 18 of the outer scale with 2:30 of the inner scale.
Result: 72km can be determined by comparing the SPEED INDEX “” of the inner
scale and corresponding outer scale indications.

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[Calculation of driving distance]
Q : Supposing that the speed is 60km/hour, what distance will a vehicle travel in 1 hour
and 20 minutes?
A : Align 60 of the outer scale with the SPEED INDEX “” of the inner scale.
Result: 80km corresponding to 1:20 of the inner scale can be gured out.
[Calculation of fuel consumption rate (consumed per hour)]
Q : If the drive time is 5 hours and 30 liters fuel are consumed, what is the fuel
consumption rate ( liters/hour)?
A : Align 30 of the outer scale with 5:00 of the inner scale.
Result: 6 Liters per hour - 60 is indicated on the SPEED INDEX “”
corresponding to the outer scale.

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[Calculation of fuel consumption]
Q : How much fuel is needed for a vehicle to run 5 hours if the fuel consumption rate of
that vehicle is 7 liters per hour?
A : Align 70 of the outer scale with the “” of SPEED INDEX of the inner scale.
Result: 35 liters - 35 corresponds to 5.
[Calculation of drive time]
Q : How many hours can a vehicle whose fuel consumption rate is 8 liters/hour run
using 40 liters of fuel?
A : Align 80 of the outer scale with the SPEED INDEX “” of the inner scale.
Result: 5 Hours - 5:00 on the outer scale corresponds to 40 of the inner scale.

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How to use the aviation function4-3.
[Calculation of time needed to travel a set distance]
Q : If the speed of an aircraft is 180 knots, how much time does it take the aircraft to y
450 nautical miles?
A : Align 18 of the outer scale with the SPEED INDEX “” of the inner scale.
Result: 2 hours and 30 minutes - 2:30 of the inner scale corresponds to 45 of the
outer scale.
[Calculation of flight distance]
Q : If the speed is 210 knots and the ight time is 40 minutes, how many nautical
miles will an aircraft travel?
A : Align 21 of the outer scale with the SPEED INDEX “” of the inner scale.
Result: 140 Nautical Miles – 14 on the outer scale corresponds to 40 of the inner
scale.

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English
[Calculation of fuel consumption rate (consumption per hour)]
Q : If the ight time is 30 minutes and 120 gallons fuel is consumed, what is the fuel
consumption rate?
A : Align 12 of the outer scale with 30 of the inner scale.
Result: 240 gallons per hour - 24 corresponding to the SPEED INDEX “”.
[Calculation of fuel consumption]
Q : If the fuel consumption rate of an aircraft is 250 gallons/hour, how many gallons
of fuel are needed to y 6 hours?
A : Align 25 of the outer scale with the “” of SPEED INDEX of the inner scale.
Result: 1,500 gallons - 15 corresponds to 6:00.

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[Calculation of the flight time]
Q : If an aircraft consumes 220 gallons per hour, how many hours can it y when
consuming 550 gallons fuel?
A : Align 22 of the outer scale with the “” of SPEED INDEX of the inner scale.
Result: Two hours and thirty minutes - 2:30 corresponds to 55 of the outer scale.
How to use the Yachting function5.
Many yacht races are set in triangular course layouts such as the one
described on the next page, where the winner is the boat that navigates
the designated course around the marks in the fastest time.
Direction: Navigational bearings are most often given in terms of degrees.
North: 0° East: 90° South: 180° West: 270°
Starboard is the right hand side of a yacht when looking forwards and is
always green, Port is the left hand side of a yacht when looking forwards
and is always red.

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<Using the rotating bezel to determine Wind Direction>
Before a race, determine the direction of the•
wind from the direction and position of the
windward mark. Line up the number
representing the wind direction (in degrees)
on the bezel with the triangle “” mark at
12 o’clock.
Ex : northeasterly wind 45°.
The course bearing from the windward mark•
to the Wing mark (starboard reach) is read
off the bezel, in degrees, at the green triangle
“” on the bottom left side of the dial.
The course bearing from the Wing mark to•
the leeward mark (port reach is read off the
bezel, in degrees, at the red “” on the
bottom right.
STARBOARD
REACH
WINDWARD LEG
RUNNING
PORT
REACH
θ
Wind Windward mark
Site mark
Start line
Leeward mark
When sailing from the windward mark to the leeward mark, the small, triangle “• ”
at the 6 o’clock position on the dial becomes the reference point for determining
course bearings.
Note : The above example is only valid for times when the θangle is 45°. At 60°,
use the values lying above the red and green triangles; at 30°, use the
values lying below the two triangles.
Using the rotating bezel to determine the favored position on the start line.

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40° − 45° 40° − 45°
Wind
Starboard tack Port tack
Wind
Wind
Wind
Start line
Most present-day yachts are capable of sailing at 45° to the wind.
To be in a position of being able to read the Wind Shift at the start of a race, make
several runs before the race matching your course as close as possible to the red (or
green) bars on the left (or right) upper portion of the watch face.
By using the rotating bezel in the following way you can determine the angle between
the start/nish line and the direction from which the wind is blowing.
The start /nish line is set at right angles to the direction of the wind, but because the
wind is always shifting direction, it is a rare occasion when a true 90° angle is achieved.
In view of this condition, line up the white triangle at the 12 o’clock position on the
watch with the direction from which the wind is blowing.
Sail from one end of the start/nish line to the other, using the white lines marked (at 3
or 9 o’clock) on the watch to site your destination.
If the course steered falls on the plus (+) side of the white line, you are on a favorable
heading to start the race when you cross the start/nish line.
If the course steered falls to the minus (-) side of the white line on the watch, you know
it is favorable to cross the start/nish line on a heading from the opposite direction.

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6. World Time
The rotating bezel (or dial ring),
may feature the names of major
city around the world in the
sequence of time difference.
The approximate time of all the
major cities can be determined by
using the rotating bezel.
Example: Perhaps you want to
know the time of Paris
while in Tokyo.
(The time is set according to the
time in Tokyo.)
Hour hand
24 hours index
For example: the present time is 10:09 p.m.
(Tokyo time)
Read and change the present time (hour) into 24-hour format. (10 o’clock p.m.1) 
22 o’clock)
Adjust the city name (Tokyo=TYO) above the rotating bezel to 22 o’clock of2)
24-hour-scale.
You can determine the time of Paris (= PAR) is 8 o’clock by reading the 24-hour3)
scale corresponding to the position of the city name displayed above the rotating
bezel.
The time difference between major cities is in hours only, the minutes remain the
same.
You can nd out the time of other cities in the same way, however be sure to account
for daylight savings time as this cannot be calculated using the bezel or dial ring.
Notes:
1. Different city names may be used in different models.
2. A 24 hour scale is not used in some models. In this case, the circumference of the
time scale on the dial is considered as 24 hours.

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Terms for units indicated on slide rules and their explanations7.

 
󰵓


Category Unit indicated on slide rule Description
NAUT. 
󰵔
STAT. 
󰵔
KM. 
󰵔
FT. 
LITERS. 󱖻
 󱖻
U.S.GAL 󱖻
󱖻
IMP.GAL 
󱖻
Distance
units
Fuel units
Weight units
Category Unit indicated on slide rule Description
KG. 󰵖
LBS. 󰵖
FUEL LBS.

󱖻
󱖻
OIL LBS.

󱖻
󱖻