Xinuo Wal-way iChart, Руководство пользователя

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Electronic chart system
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1-5-3. GPS structure:
Space part: 24 satellite(6 tracks x 4 satellite) cluding preparations satellite
。
Control part: The ground control station monitor and control the satellite.
The user part: GPS receiver.
Note: The direction angle Provided by the GPS (heading, etc) is the true north
direction, Use distinguish true north with the direction of the magnetic north
direction. The attention in use to distinguish between the real north direction and
the magnetic north direction