Operation Guide 3070 (B)
To determine the direction angle to an objective on a map and head in that direction
• You can select either hectopascals (hPa) or inchesHg (inHg) as the display |
unit for the measured barometric pressure, and Celsius (°C) or Fahrenheit |
° |
N
Objective
Current location
N | 12 o’clock | |
position | ||
|
Bearing Memory indicator
12 o’clock position
Bearing Memory direction angle
Direction angle of current reading
1.Set the map so its northerly indication is aligned with north as indicated by the watch, and determine your current location.
•See “To set a map and find your current location” for information about how to perform the above step.
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 map aligned with the readings being produced by the watch.
•If you find it difficult to perform the above step while keeping everything aligned, first move into the correct position (12 o’clock position of the watch pointed at the objective) without worrying about the orientation of the map. Next, perform step 1 again to set the map.
3.In the Timekeeping, Digital Compass, Barometer/Thermometer, or Altimeter Mode, press C to take a compass reading.
•The reading will appear on the display after about two seconds.
•The indicator (indicating the direction stored in Bearing Memory) and the direction of the watch’s 12 o’clock position will disappear from the display about 20 seconds after you perform a compass reading by pressing C. If this happens, press C again to take a new reading and to display the indicator (indicating the direction stored in Bearing Memory).
( F) as the display unit for the measured temperature value. See “To select |
the temperature, barometric pressure, and altitude units”. |
• See “Barometer and Thermometer Precautions” for important precautions. |
Barometric Pressure Graph
Barometric pressure indicates changes in the atmosphere. By monitoring these changes you can predict the weather with reasonable accuracy.
This watch takes barometric pressure measurements automatically every two hours (at the top of each
The barometric pressure graph shows readings of previous measurements for up to 24 hours. The horizontal axis of the graph represents time, with each dot standing for two hours. The rightmost dot represents the most recent reading. The vertical axis of the graph represents barometric pressure, with each dot standing for the relative difference between its reading and that of the dots next to it. Each dot represents 1hPa.
The following shows how to interpret the data that appears on the barometric pressure graph.
A rising graph generally means improving weather.
A falling graph generally means deteriorating weather.
Note that if there are sudden changes in weather or temperature, the graph line of past measurements may run off the top or bottom of the display. The entire graph will become visible once barometric conditions stabilize.
The following conditions cause the barometric pressure measurement to be skipped, with the corresponding point on the barometric pressure graph being left blank.
• Barometric reading that is out of range (260 hPa/mb to 1,100 hPa/mb or |
7.65 inHg to 32.45 inHg) |
4.After setting the map, keep the map and watch pointed in the same direction as you press E to record the currently displayed direction in
Bearing Memory.
• See “Bearing Memory” for more information.
5.Now you can advance while monitoring the indicator (indicating the direction stored in Bearing Memory) to ensure that it remains in the 12 o’clock position.
Note
•When mountain climbing or hiking, conditions or geographic contours may make it impossible for you to advance in a straight line. If this happens, return to step 1 and save a new direction to the objective.
Barometer/Thermometer
• Sensor malfunction |
Barometric Pressure Differential Pointer
This pointer indicates the relative difference between the most recent barometric pressure reading indicated on the barometric pressure graph, and the current barometric pressure value displayed in the Barometer/ Thermometer Mode.
•Pressure differential is indicated in the range of ±5 hPa, in
•The barometric pressure differential pointer is not displayed when the displayed current barometric value is outside of the allowable measurement range (260 to 1,100 hPa).
•Barometric pressure is calculated and displayed using hPa as the standard. The barometric pressure differential also can be read in inHg units as shown in the illustration.
This watch uses a pressure sensor to measure air pressure (barometric pressure) and a temperature sensor to measure temperature.
•You can calibrate the pressure sensor and the temperature sensor if you suspect that readings are incorrect.
To take barometric pressure and temperature readings
Barometric pressure differential
Current pressure greater than most recent measured pressure
inHg values
hPa values
Barometric | Pressure | Pressing B in the Timekeeping Mode or in any | |
differential | of other sensor modes enters the Barometer/ | ||
pressure graph | |||
| pointer | Thermometer Mode and starts barometric | |
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| pressure and temperature measurements | |
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| automatically . | |
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| • It can take up to four or five seconds for the | |
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| barometric pressure reading to appear after | |
|
| you enter the Barometer/Thermometer Mode. | |
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| • Barometric pressure is displayed in units of | |
| Barometric | 1hPa (or 0.05 inHg). | |
Temperature |
| ||
pressure |
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•The displayed barometric pressure value changes to xxxx hPa (or inHg) if a measured barometric pressure falls outside the range of 260 hPa to
1100 hPa (7.65 inHg to 32.45 inHg). The barometric pressure value will reappear as soon as the measured barometric pressure is within the allowable range.
•Temperature is displayed in units of 0.1°C (or 0.2°F).
•The displayed temperature value changes to xxx °C (or °F) if a measured temperature falls outside the range of
140.0°F). The temperature value will reappear as soon as the measured temperature is within the allowable range.
•In some areas, barometric pressure is expressed in millibars (mb) instead of hectopascals (hPa). It really makes no difference, because 1hPa = 1mb.
Pressure differential |
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examples in the |
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illustration are indicated | Current pressure less |
in 3 hPa/0.1 inHg steps. | |
| than most recent |
| measured pressure |
About Barometric and Temperature Measurements
•Barometric pressure and temperature measurement operations are performed as soon as you enter the Barometer/Thermometer Mode. After that, barometric pressure and temperature measurements are taken every five seconds.
•You also can perform a barometric pressure and temperature measurement at any time by pressing B in the Barometer/Thermometer Mode.
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