The accuracy of a position on any telematics display is dependent on the capabilities and setting choices of the device itself. Android smartphones have the option to turn on Location Accuracy under settings. Although this option will use more battery life, it offers more position accuracy by using additional sources other than just GPS such as Wi-Fi, Mobile Networks and Sensors.
You will find instructions for SBD Relaying under the Features list from the GSatTrack WiKi. Go to GSatTrack.com and click on the "Support" tab, then click on "WiKi". See the navigation panel to the left and click on "SBD Relaying" at the bottom of the Features list.