That's non-sense mate. If you upload the POI's and Cam locations, Then you get alerted either if you just have it running as 'a Map', OR if you have it 'navigating.'
Think of it this way, I sold my Snooper S4 because I now use the Garmin as a Cam detector. I take it with me everywhere, and just set it to 'Show Map' then you drive about and it will alert you when ever you approach a cam location.
Of course if I don't know where I am going (lol), I set it to 'Navigate' then follow the voice commands. Plus you get alerted when ever you approach a cam locations.
Works BOTH[b/] ways without a doubt.
All the best,
Lee