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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.
Can't speak directly to what might be the reason for your lack of roads, but what is shown on HERE
map creator seems to have no bearing on what is released as Garmin's current map update.
The Mississippi Forensics Laboratory has been open for around five years or more along with the new roads to get to it. However the latest Garmin 2020.10 still does not show the roads. Or have the current place or the old crime lab in it's database, or at least I've not found it. I filed a map error report with Garmin about it over three updates ago. Here Map creator shows it and the new roads. Don't know how long Here has shown it though.
My nuvi's and drivesmart are also very happy to route me via along a route that crosses a river. The only problem is the bridge has not existed in over thirty years. Hadn't told them about this one yet. Sort of lost interest in keeping them advised. None of the map errors I've reported to them have ever been fixed. Though errors I've reported to Google Maps have sometimes been fixed the same day I reported to them with a thank you from Google for making them aware of it.
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.