Bism 4GS Dive Demo Solis, Operating Manual, Page: 101 / 140

■ Magnetic north and True north.
There are two kinds of geography terms showing north, magnetic north and true north.
●Magnetic north : north which compass (bearing magnetic needle) indicates.
●True north : the direction of the North Pole point.
As shown in the right figure, the magnetic north and the true north are not same.
■
The “north” of the map generally marketed is true north.
■ This product indicates magnetic north.
■ Place to use.
If you measure a direction near what has strong influence to geomagnetism, an error arise at a
measurement value.
Please use it keeping away from the following items.
●Permanent magnet (Wrist compass, Magnetic necklace etc.)
●Metal (Metal door, Metal locker etc.) ●High-voltage line
●Overhead wires ●Electrical home appliances
(Television, Personal computer, Washing machine and Refrigerator etc.)
Accurate measurement cannot be performed in vehicles, such as a train, a ship and an airplane.
Accurate measurement cannot be performed in a room, especially in the building of reinforced concrete
construction.
■
Place to keep.
When this product becomes magnetized, the accuracy of digital compass measurement may be affected.
Please do not keep it near the items which become magnetized strongly such as permanent magnet
(wrist compass, magnetic necklace etc.), electrical home appliances (TV, PC, washing machine and
refrigerator etc.)
When the measured direction has an error, there is a possibility that the product became magnetized.
Please perform the bidirectional calibration.
101
DIRECTION READING ( COMP )
True North
Magnetic North
East West
South
[ Note ]
●The auto light switch is disabled during the 60 seconds that digital compass measurement is being
performed.
●When an alarm sounds or a light is turned on by having depressed B button during the digital
compass measurement, it stops the measurement temporarily and resumes the measurement after
the alarm stops and the light turned off.
Precautions at Digital Compass Measurement