Just to add to that a bit, the M10 definitely supports JCV and it's file structure is similar to a modern nuvi where the JCV folder goes in the hidden .system root folder. Not sure if it does support SID. If the folder's already there it does support SID. If it's not then create SID in .system, put in the SID file and see if you get IntraSearch (predictive text) when you search. If you don't get suggestions when you type, then delete the folder. I'm thinking it doesn't support SID though.
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