Voxson gps400 ユーザーガイド

GPS400 User Manual 

The following list provides answers to some commonly asked questions about the GPS400 and GPS 
navigation in general.    If you can’t find the answers you’re looking for, please feel free to contact 

customer support on 1300 889 990 or 

 

GPS is a technology that utilises a system of satellites orbiting the earth to accurately locate your exact 
position.    A GPS receiver will interpret signals sent from these satellites to calculate the device’s current 

distance from the satellites themselves.    By knowing the exact locations of the satellites, as well as your 

current distance from at least 4 satellites, the GPS receiver uses a mathematical principle known as 
Trilateration to determine your current location. 

The navigation software component takes the position calculated from the GPS receiver and represents 
that on an image of the map data.    The software then uses complex algorithms to calculate the best way 

to get from your current location, to your destination, within the bounds of the map data (i.e. staying on 

the roads rather than a straight line). 

There are a number of resources online that further explain how GPS technology works.    One simplified 
explanation is available from 

 

The GPS400 comes loaded with the latest release of the Australian mapping data from WhereIS

®

.  This 

does not always necessarily mean that every road or intersection is accurate as of the release date.    In 

some cases you may notice that changes which occurred several years ago are not yet reflected in the 
maps.    This unfortunately is a limitation of the map data and indeed applies to all GPS navigation 

solutions.  WhereIS

®

 have a system for reporting anomalies in the map data so that they may be rectified 

in future releases.    For more information regarding the WhereIS map data and coverage, please refer to 
their website