Casio 3281 Digital Compass, Digital Compass Readings, Calibrating the Bearing Sensor

Operation Guide 3261 3281

3.Press Dto move the flashing in the sequence shown below to select the other settings.

City Name	DST		12/24-Hour		Seconds		Hour	Minutes		Year
			Format
Thermometer		Power Saving		Illumination		Button Operation			Day	Month
unit				Duration		Tone On/Off

•The following steps explain how to configure timekeeping settings only.

4.When the timekeeping setting you want to change is flashing, use Eand/or Bto change it as described below.

Screen	To do this:	Do this:
	Change the city name	Use E(East) and
		B(West).
	Toggle between Daylight Saving Time (On)	Press E.
	and Standard Time (OFF).

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•While 12-hour format is selected for timekeeping, a P (PM) indicator will appear for times from noon to 11:59 p.m. No indicator appears for times from midnight to 11:59 a.m. With 24-hour format, time is displayed from 0:00 to 23:59, without any P (PM) indicator.

•The watch’s built-in full automatic calendar makes allowances for different month lengths and leap years. Once you set the date, there should be no reason to change it except after you have the watch’s rechargeable battery replaced or after power drops to Level 5 (page E-14).

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To take a digital compass reading

Screen	To do this:	Do this:
	Toggle between 12-hour (12H) and 24-hour	Press E.
	(24H) timekeeping.
50	Reset the seconds to 00	Press E.
	Change the hour or minutes	Use E(+) and B
		(–).
	Change the year, month, or day

5.Press Ato exit the setting screen.

Note

•For information about selecting a Home City and configuring the DST setting, see “Configuring Home City Settings” (page E-26).

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Digital Compass

A built-in bearing sensor detects magnetic north at regular intervals and indicates one of 16 directions on the display.

•The watch also takes temperature readings in the Digital Compass/Thermometer Mode. For more information, see “Thermometer” (page E-57).

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4. After you are finished using the digital compass, press Dto return to the mode you

Temperature				12 o’clock
North				position
						Direction
pointer
						indicator
Angle value (in degrees)
270	W		NW	NNW	0
W	NW
					N
WSW					NNE
SW						NE
SSW					E	E
S					E
180	SE	S	SE	ESE	90
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1.Place the watch on a flat surface. If you are wearing the watch, make sure that your wrist is horizontal (in relation to the horizon).

2.Point the 12 o’clock position of the watch in the direction you want to check.

3.Press Cto enter the Digital Compass/Thermometer Mode and take a digital compass reading.

•COMP will appear on the display to indicate that a digital compass operation is in progress.

•See “Digital Compass Readings” on page E-35 for information about what appears on the display.

Note

•If a value appears to the right of the direction indicator, it means that the bearing memory (page

E-45) screen is displayed. If this happens, press Ato exit the bearing memory screen.

entered the Digital Compass/Thermometer Mode from.

Digital Compass Readings

•When you press C to start digital compass measurement, COMP will appear on the display initially to indicate that a digital compass operation is in progress.

•About two seconds after you start a digital compass measurement operation, letters on the display will indicate the direction that the 12 o’clock position of the watch is pointing. Four pointers that indicate magnetic north, south, east, and west also will appear.

•After the first reading is obtained, the watch will continue to take digital compass readings automatically each second for up to 20 seconds. After that, measurement will stop automatically.

•The direction indicator and angle value will show - - - to indicate that digital compass readings are complete.

•The auto light switch is disabled during the 20 seconds that digital compass readings are being taken.

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•The following table shows the meanings of each of the direction abbreviations that appear on the display.

Direction	Meaning	Direction Meaning		Direction	Meaning	Direction Meaning
N	North	NNE	North-	NE	Northeast	ENE	East-
			northeast				northeast
E	East	ESE	East-	SE	Southeast	SSE	South-
			southeast				southeast
S	South	SSW	South-	SW	Southwest	WSW	West-
			southwest				southwest
W	West	WNW	West-	NW	Northwest	NNW	North-
			northwest				northwest

•The margin of error for the angle value and the direction indicator is ±11 degrees while the watch is horizontal (in relation to the horizon). If the indicated direction is northwest (NW) and 315 degrees, for example, the actual direction can be anywhere from 304 to 326 degrees.

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•Magnetic Declination Correction

With magnetic declination correction, you input a magnetic declination angle (difference between magnetic north and true north), which allows the watch to indicate true north. You can perform this procedure when the magnetic declination angle is indicated on the map you are using. Note that you can input the declination angle in whole degree units only, so you may need to round off the value specified on the map. If your map indicates the declination angle as 7.4°, you should input 7°. In the case of 7.6° input 8°, for 7.5° you can input 7° or 8°.

•Bidirectional Calibration and Northerly Calibration

Bidirectional calibration and northerly calibration calibrate the accuracy of the bearing sensor in relation to magnetic north. 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 becomes 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).

•Note that taking a measurement while the watch is not horizontal (in relation to the horizon) can result in large measurement error.

•You can calibrate the bearing sensor if you suspect the direction reading is incorrect.

•Any ongoing direction measurement operation is paused temporarily while the

watch is performing an alert operation (daily alarm, Hourly Time Signal, countdown timer alarm) or while illumination is turned on (by pressing B). The measurement operation resumes for its remaining duration after the operation that caused it to pause is finished.

•See “Digital Compass Precautions” (page E-54) for important information about taking direction readings.

Calibrating the Bearing Sensor

You should calibrate the bearing sensor whenever you feel that the direction readings being produced by the watch are off. There are three different calibration methods available: magnetic declination correction, bidirectional calibration, and northerly calibration.

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Important!

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.

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