You can report a map error to Garmin via an Error Report Form. There's a link on this explanatory page:
Code:
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That of course won't help you with the current mapping data on your device but they should incorporate it in some future update, in the next year or perhaps much sooner if they get many reports of the same error and consider it a serious issue.
I recall at least one device series in which the SL could be modified 'on the fly' and that's the nuvi 35x0 models from memory. It may have been dropped in later firmware updates however.
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