Casio 3280 Digital Compass Readings, Calibrating the Bearing Sensor, -N, OFF, OFF, lll, lll, COMP, Note, COMP, Meaning, Meaning, Direction, Direction, Important

Operation Guide 3260 3280

To take a digital compass reading

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

Temperature				12 o’clock
				12 o’clock
North				position
North						Direction
pointer						Direction
pointer						indicator
						indicator
Angle value (in degrees)
270	NW NW NN			W	0
270	W			W	0
W					N
WSW					NNE
SW						NE
SSW					E	E
SSW

S					E
180	ES	S	ESE		90
E-50		S	SE
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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-51 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-61) 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).

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To perform magnetic declination correction

	Magnetic declination	1. In the Digital Compass/Thermometer Mode, hold down
	Magnetic declination	Auntil the current magnetic declination settings start
	angle direction value	Auntil the current magnetic declination settings start
	(E, W, or OFF)	to flash on the display. This is the setting screen.

•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-70) 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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• The illustration, for example, shows the value you should input and the direction

setting you should select when the map shows a magnetic declination of 1°

West.

3. When the setting is the way you want, press Ato exit the setting screen and take

l	ll
		l
l
l l
l	ll
		l
l
l		l
ll

Magnetic declination angle value

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2.Use E(East) and B(West) to change the settings.

•The following explains magnetic declination angle direction settings.

OFF: No magnetic declination correction performed. The magnetic declination angle with this setting is 0°.

E: When magnetic north is to the east (east declination)

W: When magnetic north is to the west (west declination)

•You can select a value within the range of W 90° to E 90° with these settings.

•You can turn off (OFF) magnetic declination correction by pressing Eand Bat the same time.

direction and temperature readings.

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 while calibration of either direction is in progress.

•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 take direction readings in an open field, for example, calibrate in an open field.

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To perform bidirectional calibration

lll		1. In the Digital Compass/Thermometer Mode, hold down
lll		Auntil the current magnetic declination settings start
l	l
l	l
l

l	l
l		to flash on the display. This is the setting screen.
		to flash on the display. This is the setting screen.

2.Press Dto display the bidirectional calibration screen.

•At this time, the north pointer flashes at the 12 o’clock position and the display will show -1-to indicate that the watch is ready to calibrate the first direction.

3.Place the watch on a level surface facing any direction you want, and press Cto calibrate the first direction.

•- - - is shown on the display while calibration is being performed. When calibration is successful, the display will show OK and -2-, and the north pointer flashing at the 6 o’clock position. This means that the watch is ready for calibration of the second direction.

4.Rotate the watch 180 degrees.

5.Press Cagain to calibrate the second direction.

•- - - is shown on the display while calibration is being performed. When calibration is successful, the display will show OK and then take direction and temperature readings.

To perform northerly calibration

Important!

If you want to perform both northerly and bidirectional calibration, perform bidirectional calibration first, and then perform northerly calibration. This is necessary because bidirectional calibration cancels any existing northerly calibration setting.

l	l	1. In the Digital Compass/Thermometer Mode, hold down
lll
l	l	Auntil the current magnetic declination settings start
l
ll l

to flash on the display. This is the setting screen.

2.Press Dtwice to display the northerly calibration screen.

•At this time, -N-(north) appears on the display.

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