I use EZGmap to merge the img files into one, I have 10 merged on one sd card at the moment. Found each map id with Gmap Tool and generated unlock codes with Garmin Kgen and put them all into one unl file. Also have Europe travel guide working and put the unlock code into the same unl file. All files add up to 1.6mg and are working fine. Thanks everone for all the info that I managed to find.
Cheers
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