Navman PiN 570 Firmware?

[Strawbs]

I'm new to SatNav & have had my Pin 570 for only a few weeks now! I am struck by how long it can sometimes take to get a sat lock-on & then how weak the signal is! It also shows the vehicle is moving at a rate of between 0.2 - 0.4mph when I sit with the handbrake on. 8O

I've solved the issue I have with the tiny onscreen keyboard in SmartST 2005 by installing Navigator 5. But I would like to flash the firmware to one that gives better signal strength & accuracy! Does anyone know of a firmware update that is available & where I can get it? or failing that - any way to boost reception by means of accessing & reprogramming the current software?

Thanks in advance.
S.

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