6-16
About GPS (Global Po-
sitioning System)
GPS (Global Position System) :
GPS is a system developed and operated
by the United States that determines the
user’s current position (longitude, latitude,
etc.) by using 4 or more satellites.
This system is used with related GPS infor-
mation, various sensors, road map data,
and other related information to provide
navigation services.
i Information
• For continued map updates, information-
gathering and surveys are conducted con-
tinuously to monitor road changes or new
road constructions. Nonetheless, roads,
facilities, and fares are under constant
change and it is impossible to completely
remove all errors, including road updates,
names, facilities, and fares. Please keep
this in mind when using GPS.
• In principle, roads with widths less than
3 yards are not included within the map
data. Roads with sections with widths less
than 3 yards may be deleted in future map
data updates.
When GPS Info Cannot Be Used
GPS info may not operate under the fol-
lowing conditions :
• W h e n b u i l d i n g s , t u n n e l s , o r o t h e r
obstructions block satellite signals.
• When materials are placed above the
GPS antenna and block satellite signals.
• When the satellite is not transmitting.
• When a digital cellular phone (1.5GHz)
is placed near the GPS antenna.
Errors Unavoidable Due to Sys-
tem Characteristics
• The navigation system uses GPS infor-
mation, various sensors, road map data,
and other related information to display
the current position.
• Errors may occur if the satellite is trans-
mitting inaccurate signals or only two or
less satellite signals can be received.
• Errors that occur in such conditions can-
not be corrected.
GPS Information
