Mio Product Key

hi all gps/pda/wince experts... [sorry accidentally posted identical question in EE lounge]
here's something, but pardon my ignorance - gps navigation systems is quite new to me.
I have a NAVMAN MY-55 (my-series is new). Like many gps navigation companies, they offer service to purchase their additional maps, say of western europe. The purchase is really a purchase of an unlock key (like most softwares)... whereupon using in conjuction with the DVD that comes with the unit, will unlock and allow the map on the DVD to be copied and installed correctly on the MY-55 machine.
So here's my thing: the map cost $129, and I have heard essentially it is a platform running win ce. Apparently, running win ce implies that this device can also be 'unlocked' by using something such as 'mio' - i guess a software that bypasses the NAVMAN's interface and allows direct access to the bigger picture, the native OS... enabling other features such as video playing etc... And more importantly in this case, is the use of OTHER navigation softwares on the unit - therefore allowing multiple navigational softwares and their appropriate maps to be operated on this 'navman' machine, essentially opening up the unit.
QUESTION: Is the above understanding correct (save my poor explaination of it)?
QUESTION: Does ANYONE know of a NAVMAN activation key/code bypass/keygen (?!) for MY-SERIES.
QUESTION: Are there any drawbacks to opening up the system to mio (or other equivalents)... because it seems like it's mostly beneficial.
QUESTION: How else can i navigate using some WESTERN EUROPE MAP (keyword is navigate, because apparently some other hacks only allow 'virtual' use of map instead of actual gps navigation simultaneous with map)...
QUESTION: pdf reading on an unlocked unit??
I know this will seem like a plead for workarounds something legit, but I think this may be bit beyond that in that mio unlocks the machine and enables the unit for other purposes.
I'm very keen to know more about these things, but right now, i'm very very anxious to know what EE can provide in terms of advice for a western europe map for this device. Thanks thanks thanks!!!!
daniel. Mio Map Update Promo. Get a free map update from Mio.
Today’s world is evolving rapidly and we want to make sure that you can navigate these changes as easily as possible. To make sure that your Mio GPS stays up to date, Mio is offering owners of the Mio Moov family of products or Knight Rider GPS by Mio a FREE map update.
To qualify for and receive your free map update, please follow the steps outlined below:
Purchase any Mio Moov product or the Knight Rider GPS by Mio.
Register for The Map's on Mio promotion by February 20, 2009.
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Registrants of The Map's on Mio promotion will receive their free map update in 2009. Actual ship date is subject to change. For more information about Mio GPS products or where to purchase Mio GPS products, please visit www.mio.com/us.
The Map's on Mio free map update promotion is good for Mio Moov 200, 200c, 210, 300, 300c, 300x, 310 and 500 and Knight Rider GPS by Mio only. Offer good for United States and Canada only. To qualify for the The Map's on Mio promotion, customer must register qualifying product by February 20, 2009.