LocViewer loads map sections according to the current position from a Web service from the Internet and indicates the position on the display of the mobile phone. As data source e.g. road maps or satellite photos can be selected. In addition the speed and the moving direction are indicated. The map sections can be panned and zoomed.
In order to reduce data traffic, the map sections are stored in the mobile phone. So a map section must be downloaded only once.
LocViewer runs on all phones which support at least CLDC 1.1 and MIDP 2.0 and allow access to Bluetooth (JSR 82) or the serial interface (data cable). That applies to nearly all current mobile phone models. Alternatively an integrated GPS receiver can be used if it can be accessed using JSR 179.
GPS receivers with Bluetooth or serial interface are supported, which provide the NMEA 0183 sentences GGA and VTG or RMC. That nearly all at the market available might be.
In the connection mode “Network/Internal” the Location API (JSR 179) is used. In this case no external GPS receiver is needed. In this case the location is determined by the GPS receiver or by the network provider. The latter is obviously supported however in Germany so far by no provider.