Seiko Astron Complete User Manual page 6

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READ FIRST
Mechanism by which the GPS solar watch sets time and date
What GPS is
GPS stands for Global Positioning System, a satellite positioning system
for determining the current position on the earth.
24 satellites cover the earth, and at present, the system is operated by
approximately 30 GPS satellites.
Wherever you are in the world, the position can be determined
(positioned) by information from more than 4 GPS satellites.
GPS satellite
This is a satellite operated by the United States
Department of Defense (official name is NAVSTAR), and
orbits the earth at an altitude of 20,000 km.
Initially, this was a military satellite, but at present,
information is partially disclosed to the public and used in
various equipment including car navigation systems and
cellular phones.
The GPS satellite is mounted with a high-accuracy atomic
clock with an accuracy deviation of 1 second per 100,000
years.
ASTRON 8X82 GPS SOLAR
Mechanism by which this watch sets the time
and date
This watch receives GPS signals from GPS satellites to set the
time and date based on the following information.
• Precise time and date based on the atomic clock
• Information about a time zone where you are
(The current location is basically positioned by more
than 4 GPS satellites, and which zone of the total of 40
time zones around the world you are in is identified.)
 To receive information about a time zone where you
are, it is necessary to adjust the time zone.
 How to adjust the time zone
 Unlike navigation equipment, this GPS solar watch is
not designed to constantly receive GPS signals from
GPS satellites without any operation.
This watch receives GPS signals from GPS satellites
only in the time zone adjustment mode, automatic or
manual time adjustment mode.
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