Not sure about the first part of your post as I don't have a 7025, that's the first I've heard of that option.
Regarding the network search option, if this is ticked, it will look at the NIT table for transponders with other channels in and scan them too. Usually you need to scan the default frequency on that symbol rate to be able to access the NIT table...but I'm not an expert at that shit so not 100% sure.
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