If you have a problem with the empeg freezing or rebooting during engine start, there is a solution to your problem, expensive yes.
Try http://www.iotech.com/catalog/daq/catdbk34.html where there is a DC UPS for only 595$

Mark
emaks rouls #10677
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Mark wait for mk III with a USB Host/slave (USB->GPS)(USB->Bluetooth)(USB->You name it)