Ok, here it is...The logo is the same as the one for nuvi 2x5w. Unfortunately I am not sure is the JCV function available in the FW of the zumo 660 EU/US. Needs experimenting. The logo needs changing in the header to be enabled JCV. Better ask the guys in that topic for their help:
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]

...otherwise...other firmware...