Subaru Legacy Manuals 2013 Legacy Navigation System Manual | Page 340

Reference

• 2D positioning and 3D positioning

About Trademarks

Actual position
Signals do not cross at one point

Position determined by 2D positioning

GPS calculates positions using triangulation.
The distance to the satellite can be determined when the radio wave
from that satellite is received, and the current location can be
measured by receiving radio waves from 3 satellites.
However, because there is a margin of error in the GPS satellites and
navigation unit, positioning is performed in only the 2 dimensions of
latitude and longitude when radio waves from only 3 satellites can
be received. The precision will be lower in this case. When radio
waves from 4 or more GPS satellites are received, positioning is
performed in the 3 dimensions of latitude, longitude, and altitude.
3D positioning is more precise than 2D positioning, and it reduces
the margin of error in the vehicle location display.

338 Other

• This product uses the NetFront FlexUI of ACCESS Co., Ltd.
ACCESS, the ACCESS logo and NetFront are the trademarks and
registered trademarks of ACCESS Co., Ltd. in Japan, the USA and
other countries.

© 2010 ACCESS CO., LTD. All rights reserved.
Some parts of the software in this product contain modules
developed by the Independent JPEG Group.
• NAVTEQ ON BOARD is a trademark of NAVTEQ in the USA and other
countries.

© 1993 - 2010 NAVTEQ. All rights reserved.