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I did create a lot of "weeds"........ <<grin>> I just can't help myself, sometimes tangent paths are to irresistible for me.
The vendor you bought it from is the first place you should look. If for whatever reason Garmin shows the id of this specific device as only having a limited mapset, then that will only be problematic for future updates. So you need to ensure the vendor sold you what you bought.
I don't understand your concern here. Being mounted as a portable device, which should give it a removal policy of "3", is the safest method to protect it from corruption due to unexpected removal. The other removal policies do nothing to ensure a better outcome, they just let Windows and other programs behave in a riskier manner.I am not happy that the 680T is definitely mounted as a portable device and not needing safe release.
You can verify the removal policy when the device is connected by right clicking on any storage device in the file explorer and selecting "properties" then the "hardware" tab, then select the correct device from the list and then the "properties" button near the bottom, then the "details" tab, then select "removal policy" from the dropdown list. If it is a "3", then Windows will not cache writes to that device. It is write caching which causes file corruption due to unexpected removal.
Ibid....what boyd said. I don't like to fuss with a lot of tedius prep either. I just review the route I want to go on my computer, then see if the gps generally agrees then go. Like Boyd, usually I wind up taking deviations the gps doesn't like, but so what. If the gps doesn't like my way it can get it's own car and drive itself <<grin>>.
I use my old nuvi 205w to plug in my destination and give me the overall trip navigation. Then for restaurants, POI's and such I use my smart phone. I also tend to use my smart phone for navigation within a large unfamiliar city.
My reasoning for using the smart phone is that it's got the power of the internet behind it and will be more up to date. But for the interstate and highway travel, my nuvi.... even with old maps is more than adequate.