What is the latest software known to work with Navigo ( Ebuyer ) sat navs?

I've had a 4.3 inch Navigo satnav for a couple of years or so courtesy
Ebuyer.

I ditched the Tubodog 5 default software quite soon after buying and have
run Mio Maps 3.3 with full European maps dated ( I think 2008 ) since.
Found it easy to change the software using a spare SD card.
It works well, no complaints, and has speed camera warnings.

I wondered what was the latest software(s) known to work with the Navigo
with ( maybe ) more recent maps - speed cameras essential.

Or, if no speed cams, I don't mind buying another or two SD cards for it to
experiment with trekking maps, aviation and / or maritime maps ( just out of
curiosity really, I only use it in the car ).
Anything interesting really that I can play with.

Any software needs to be PC loadable to JUST to the SD card with minimum (
eg:
exe file name change ) hacks.

I have only ever changed the content of the SD card and am not going to risk
bricking the unit by using any severe hacks or registry hacks.
No ActiveSyncs to the main memory.

Oh, and by the way, freely downloadable and with hotlinks ideally.

Any ideas???

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