I assume that it is shortened from signature, considering that this is what manufacturers often do.
They use their own custom (adapted) software.
The system is not similar but is completely based on iGO. The content (maps) is absolutely identical, of course.
The update procedure is not as simple as you think Unit (software) must be p*tched. Search in the [Only registered and activated users can see links. ] section. Or even better on specialized Forums.
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