VBOX 3iSL User Guide
Page 40 of 49
01/12/2011
VBOX 3iSL not responding - GPS Coldstart
The GPS engine has locked up.
Perform a GPS Engine Coldstart
A GPS coldstart forces the GPS engine to reset its downloaded almanac of current satellite positions. This can be useful if a VBOX 3iSL is having trouble locking
onto satellites, which typically occurs if a VBOX 3iSL has not been used for several weeks or if it was last used a long distance (over one thousand miles) away from
the current location.
After performing a GPS coldstart leave the VBOX 3iSL
powered up in a static location where the antenna has an unobstructed view of the skies until the „GPS‟ LED
becomes solid green.
Once the VBOX 3iSL has downloaded the new almanac it will reacquire satellites in noisy situations (such as near trees, buildings and under bridges) much more
quickly. It will also acquire satellite much more quickly on power-up.
To perform a GPS coldstart on a VBOX 3iSL perform the following actions:
Press and hold the „LOG‟ button on the front of the VBOX 3iSL for five seconds until a long beep is sounded.
When the button is released the „GPS‟ LED will start to flash red showing that the Coldstart has been performed and the GPS engine is now not locked onto
any satellites.
After approximately 30-
45 secs the „GPS‟ LED will start to flash green indicating that satellite lock has been achieved and indicating the number of satellites
that it is locked onto.
