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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.
A brand new Garmin chart plotter, fish finder or sounder all come with a new power/data cable. So if the pinout isn't the same, then it's a no-brainer to replace. IMO.
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.
It's an old and discontinued product. So maybe one will turn up eventually on ebay or elsewhere if you only want the same. I don't know the number of pins on your device, however for my garmin marine products, I was able to use the same power/data cable with three maybe four or more different chartplotters that were brand new products over the course of 12 years.
I think the last garmin chart plotter I got circa 2016 did require a change, but I don't remember whether it was because of the unit having more pins or just that a reconfiguration of the boat required a longer cable and the original had be cut too short. To late to check now, unfortunately I'm without a boat now.
So you've got a good chance, I think of finding something used on ebay of a different and newer model that will still have the same pinout. Likely, if you aren't using this in conjunction with other nema enabled devices, then you probably are only using two wires in the current cable. They are just the positive and negative power wires. Don't be afraid of a new device with more wires. Because if you still don't need it to talk to other nema enabled devices or turn on a additional alarm, then you still will only need two of the wires in the cable connected to anything.