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1890-6
Calibrating the Bearing Sensor
Whenever you suspect that direction readings produced by the watch are
wrong, you should calibrate it. You can use either one of two calibration
procedures:
bidirectional calibration
or
northerly calibration
.
Use bidirectional calibration when you want to take readings within an area
exposed to magnetic force. This type of calibration should be used if the
watch become magnetized for any reason.
With northerly calibration, you “teach” the watch which way is north (which
you have to determine with another compass or some other means). You
could use this calibration procedure, for example, to set the watch to indicate
true north instead of magnetic north.
Important!
• If you want to perform both bidirectional and northerly calibration, be sure to
perform bidirectional calibration first, and then perform northerly calibration.
This is necessary because bidirectional calibration cancels any previously
set northerly calibration setting.
• The more correctly you perform bidirectional calibration, the better the
accuracy of the bearing sensor readouts. You should perform bidirectional
calibration whenever you change environments where you use the bearing
sensor, and whenever you feel that the bearing sensor is producing
incorrect readings.
To perform bidirectional calibration
1. While in the Navigation Mode, hold down
A until the upper display changes to show
-1-.
• At this time, the magnetic north pointer
flashes at the 12 o’clock position to indicate
that the watch is ready to calibrate the first
direction.
2. Place the watch on a level surface facing
any direction you want, and press C to
calibrate the first direction.
• When the calibration procedure is complete, the message
OK appears in
the upper display. This soon changes to
-2- and the magnetic north
pointer flashes at the 6 o’clock position to indicate that the watch is ready
for the second direction.
3. Rotate the watch 180 degrees.
4. Press C again to calibrate the second direction.
• When the calibration procedure is complete, the message
OK appears in
the upper display. After a short while, the watch automatically returns to the
Navigation Mode’s initial screen.
Precautions about bidirectional calibration
• You can use any two opposing directions for bidirectional calibration. You
must, however, make sure that they are 180 degrees opposite each other.
Remember that if you perform the procedure incorrectly, you will get wrong
bearing sensor readings.
• Do not move the watch during the one or two seconds (from the point you
press C up to the point that
OK appears in the upper display) that the
calibration of each direction is in progress. If you do, the message
ERR
appears in the upper display, which means you have to restart the
bidirectional calibration procedure from the beginning.
• The appearance of
ERR during bidirectional calibration can also be
caused by local interference. If you suspect that this is the case, move to
another location and try the procedure again.
• You should perform bidirectional calibration in an environment that is the
same as that where you plan to be taking direction readings. If you plan to
use it in an open field, for example, calibrate in an open field.
To perform northerly calibration
1. While in the Navigation Mode, hold down
A until the upper display changes to show
-1-.
2. Press D to start the northerly calibration
procedure.
• At this time, the indicator
0° appears in the
upper display.
3. Place the watch on a level surface, and
position it so that its 12 o’clock position
points north (as measured with another
compass).
4. Press C to start the calibration operation.
• When the calibration procedure is complete, the message
OK appears in
the upper display. After a short while, the watch automatically returns to the
Navigation Mode’s initial screen.
Questions & Answers About Direction Readings
Question: What causes incorrect direction readings?
Answer:
• Incorrect bidirectional calibration. Perform bidirectional calibration.
Remember that bidirectional calibration is required whenever batteries are
replaced.
• Nearby source of strong magnetism, such as a household appliance, a
large steel bridge, a steel beam, overhead wires, etc., or an attempt to
perform direction measurement on a train, boat, etc. Move away from large
metal objects and try again. Note that digital compass operation cannot be
performed inside a train, boat, etc.
Question: What causes different direction readings to produce differ-
ent results at the same location?
Answer: Magnetism generated by nearby high-tension wires are interfer-
ing with detection of terrestrial magnetism. Move away from the
high-tension wires and try again.
Question: What does it mean when
--- appears in place of a direction
value?
Answer: This is the abnormal magnetic field indicator. It means that strong
magnetism is being generated nearby. Move away from the source
of strong magnetism and try again.
Question: Why am I having problems taking direction readings indoors?
Answer: A TV, personal computer, speakers, or some other object is
interfering with terrestrial magnetism readings. Move away from
the object causing the interference or take the direction reading
outdoors. Indoor taking direction readings are particularly difficult
inside ferro-concrete structures. Remember that you will not be
able to take direction readings inside of trains, airplanes, etc.
A
D
B
C
A
D
B
C
*
Based on data as of June 1998.
CITY CODE TABLE
City Code
– – –
HNL
ANC
LAX
DEN
CHI
NYC
CCS
RIO
– – –
– – –
GMT
LON
PAR
CAI
JRS
JED
THR
MRU
KBL
KHI
DEL
DAC
RGN
BKK
HKG
TYO
ADL
SYD
NOU
WLG
City
HONOLULU
ANCHORAGE
LOS ANGELES
DENVER
CHICAGO
NEW YORK
CARACAS
RIO DE JANEIRO
LONDON
PARIS
CAIRO
JERUSALEM
JEDDAH
TEHRAN
MAURITIUS
KABUL
KARACHI
DELHI
DHAKA
YANGON
BANGKOK
HONG KONG
TOKYO
ADELAIDE
SYDNEY
NOUMEA
WELLINGTON
GMT
Differential
–11
–10
–09
–08
–07
–06
–05
–04
–03
–02
–01
+00
+01
+02
+03
+3.5
+04
+4.5
+05
+5.5
+06
+6.5
+07
+08
+09
+9.5
+10
+11
+12
Other major cities in same time zone
PAGO PAGO
PAPEETE
NOME
SAN FRANCISCO, LAS VEGAS,
VANCOUVER, SEATTLE, DAWSON CITY
EL PASO, EDMONTON
HOUSTON, DALLAS/FORT WORTH, NEW
ORLEANS, MEXICO CITY, WINNIPEG
MONTREAL, DETROIT, MIAMI, BOSTON,
PANAMA CITY, HAVANA, LIMA, BOGOTA
LA PAZ, SANTIAGO, PORT OF SPAIN
SAO PAULO, BUENOS AIRES,
BRASILIA, MONTEVIDEO
PRAIA
DUBLIN, LISBON, CASABLANCA,
DAKAR, ABIDJAN
MILAN, ROME, MADRID, AMSTERDAM,
ALGIERS, HAMBURG, FRANKFURT,
VIENNA, STOCKHOLM, BERLIN
ATHENS, HELSINKI, ISTANBUL,
BEIRUT, DAMASCUS, CAPE TOWN
KUWAIT, RIYADH, ADEN, ADDIS
ABABA, NAIROBI
SHIRAZ
DUBAI, ABU DHABI, MUSCAT
MUMBAI, CALCUTTA
COLOMBO
JAKARTA, PHNOM PENH, HANOI,
VIENTIANE
SINGAPORE, KUALA LUMPUR, BEIJING,
TAIPEI, MANILA, PERTH, ULAANBAATAR
SEOUL, PYONGYANG
DARWIN
MELBOURNE, GUAM, RABAUL
PORT VILA
CHRISTCHURCH, NADI, NAURU ISLAND