E-32
Using Bearing Memory
Bearing Memory lets you temporarily store and display a direction
reading so you can use it as a reference as you take subsequent digital
compass readings. The Bearing Memory screen displays the direction
angle for the stored reading, along with a pointer that indicates the stored
reading.
When you take digital compass readings while the Bearing Memory
screen is displayed, the direction angle of the current digital compass
reading (as read from the 12 o’clock position of the watch) and the stored
Bearing Memory direction reading will both be shown.
To store a direction angle reading in Bearing Memory
1. Press
C
to start a digital compass reading operation (page E-26).
• Thi
sec
• If a bea
mea
this happens, press
E
to cle
exit the
12 o’clock position
North pointer
Direction
angle of
current
reading
Bearing Memory
Screen
Bearing
memory
direction
angle value
Pointer to bearing
in bearing memory
12 o’clock position
North pointer
Direction
angle of
current
reading
Bearing Memory
Screen
Bearing
memory
direction
angle value
Pointer to bearing
in bearing memory
E-33
2. During the 60 seconds that digital compass readings are being taken, press
E
to store the current
reading in Bearing Memory.
• The B
Me
and p
• You can pres
C
at any ti
60
that t
disa
• Dur
direc
C
whil
the di
• Pressing
E
whil
Bea
Using the Digital Compass While Mountain Climbing or Hiking
This section provides three practical applications for using the watch’s built-in digital compass.
• Setting a map and fi
Having an idea of your current location is important when mountain climbing or hiking. To do this, you
need to “set the map”, which means to align the map so the directions indicated on it are aligned with
the actual directions of your location. Basically what you are doing is aligning north on the map with
north as indicated by the watch.
• Finding the bearing to an objective
• Determining the direction angle to an objective on a map and heading in that direction
E-34
To set a map and fi
1. With the watch on your wrist, position it so the face is horizontal.
2. While in the Timekeeping Mode or in any of the sensor modes, press
C
to take a compass reading.
• The re
3. Rotate the map without moving the watch so the northerly direction
indicated on the map matches north as indicated by the watch.
• If the wa
map’s mag
bee
the m
“Ca
• This will position
4. Determine your location as you check the geographic contours around
you.
N
N
North indicated
on the map
North indicated by
north pointer
N
N
North indicated
on the map
North indicated by
north pointer
E-35
To fi
1. With the watch on your wrist, position it so the face is horizontal.
2. Set the map so its northerly indication is aligned with north as indicated
by the watch, and determine your current location.
• Se
info
3. Next, set the map so the direction you want to travel on the map is
pointed straight in front of you.
4. While in the Timekeeping Mode or in any of the sensor modes, press
C
to take a compass reading.
• The re
5. Still holding the map in front of you, turn your body until north as
indicated by the watch and the northerly direction on the map are
aligned.
• Thi
so th
N
N
Objective
Current
location
12 o’clock
position
Steps 3 and 4
N
N
Objective
Current
location
12 o’clock
position
Steps 3 and 4
E-36
To determine the direction angle to an objective on a map and head in that direction (Bearing Memory)
1. Set the map so its northerly indication is aligned with north as indicated
by the watch, and determine your current location.
• Se
info
2. As shown in the illustration to the left, change your position so you (and
the 12 o’clock position of the watch) are pointed in the direction of
objective, while keeping the northerly direction indicated on the map
aligned with north as indicated by the watch.
• If you fi
ever
pos
abo
the map.
N
N
Objective
Current
location
12 o’clock
position
N
N
Objective
Current
location
12 o’clock
position
E-37
3. While in the Timekeeping Mode or in any of the sensor modes, press
C
to take a compass reading.
4. While direction angle readings are in progress, press
E
to record the
currently displayed direction in Bearing Memory.
• The d
will re
• T
Bearing Memor
C
.
• Se
5. Now you can advance while monitoring the Bearing Memory pointer to
ensure that it remains in the 12 o’clock position.
• Pressing
E
whil
Bea
Me
reading in
Note
• When mountain climbing or hiking, conditions or geographic
con
line. I
the objectiv
12 o’clock position
North
pointer
Direction angle of
current reading
Bearing memory
direction angle value
Pointer to
bearing in
bearing memory
12 o’clock position
North
pointer
Direction angle of
current reading
Bearing memory
direction angle value
Pointer to
bearing in
bearing memory
E-38
Digital Compass Precautions
Magnetic North and True North
The northerly direction can be expressed either as magnetic north or true
north, which are different from each other. Also, it is important to keep in mind
that magnetic north moves over time.
• Magnetic north is the north that is indicated by the needle of a compass.
• True north, which is the location of the North Pole of the Earth’s axis, is the
north that is normally indicated on maps.
• The difference between magnetic north and true north is called the
“declination”. The closer you get to the North Pole, the greater the
declination angle.
Location
• Taking a direction reading when you are near a source of strong magnetism can cause large errors in
readings. Because of this, you should avoid taking direction readings while in the vicinity of the
following types of objects: permanent magnets (magnetic necklaces, etc.), concentrations of metal
(metal doors, lockers, etc.), high tension wires, aerial wires, household appliances (TVs, personal
computers, washing machines, freezers, etc.).
• Accurate direction readings are impossible while in a train, boat, air plane, etc.
• Accurate readings are also impossible indoors, especially inside ferroconcrete structures. This is
because the metal framework of such structures picks up magnetism from appliances, etc.
True north
Earth
Magnetic north
True north
Earth
Magnetic north
E-39
Storage
• The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of
this, you should store the watch away from magnets or any other sources of strong magnetism,
including: permanent magnets (magnetic necklaces, etc.) and household appliances (TVs, personal
computers, washing machines, freezers, etc.).
• Whenever you suspect that the watch may have become magnetized, perform the procedure under “To
perform bidirectional calibration” (page E-30).
Operation Guide 3415
