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It was posted on another site that 2019.10 was taken down by Garmin due to some kind of problem. I tried last week with my Nuvi 3550 and it said I was up to date with 2018.30.
This should work, but there are a number of caveats to this approach. For starters, downloaded Garmin maps are copy protected and will only work on the original device for which they were purchased. If you sell or lose the original GPS, they become worthless.
The big limitation is a little less obvious though. Garmin devices have a limit to the number of map "tiles" (also called "segments") that can be accessed. This limit has no relation to the size of the map in gigabytes. Most newer handhelds are limited to about 4,000 map segments. There is no standard size for a map segment, it's up to whoever makes the map. A segment could cover a whole country or only one city. City Navigator does not use very many segments but some topo maps have a large number of segments.
Here in the US, Garmin sells 24k topo maps that each cover just a few states. If you install just two of these maps, you will probably hit the segment limit even though the actual files will only be a total of less than 8gb. Third party maps may also have a lot of segments. I believe it's not possible to load the entire US OpenStreetMap due to the number of segments for example.
Garmin has claimed that their automotive devices do not have the same segment limits as their handheld units. This doesn't make sense to me, but it's what they have said. I believe that a few of their newest handhelds (perhaps the newest Montana, Oregon and GPSMap276cx?) have increased the segment limit to 10,000.
But the bottom line is that with most of Garmin's handheld devices, you are likely to hit the segment limit long before you fill a 32gb memory card.
I think the version numbers are only useful in determining whether your device is up to date, or if there's a bug in the new firmware you might want to revert to an earlier version. Aside from that, those number are irrelevant and certainly are not a basis for comparison between different series.
Garmin automotive units have gone through a slow evolution of features. Typically each new series has something slightly different. Looking back, the Nuv 600 series did not offer multi-point routing and did not record or display a track log. IIRC, those features were added with the 700 series. Then another series came along and added the speed limit display, lane assist and junction view came after that and so forth.
Around 2010 they completely abandoned traditional garmin multi-point routes and replaced them with "trips" that could only be created on the device itself. All the new models were unable to either send or receive routes from Mapsource or Basecamp. Why they did this is still a mystery. But there was such an outcry that they introduced one-way route transfer from the computer to the gps in the next Nuvi series. This was still very limited and the whole "trip planner" fiasco continued until 2013 (IIRC) when they finally brought back the full functionality of the old Nuvi models.
The 2012 models introduced an interesting feature of custom dashboards that actually allowed you to design your own map screen. Then in 2013, they removed that feature and never brought it back. http://forums.gpsreview.net/discussion/26442/making-customized-dashboards/p1
They did the same thing with custom speed limits, where the user could enter their own limit if it was missing from the map. Advanced pedestrian mode was something they introduced in 2010 (IIRC), it provided a different map screen and cursor and allowed routing via mass transit if you purchased a special map. A few years later they discontined those maps and removed the pedestrian mode from the new models.
In 2010 they introduced the Nuvi 3790 which was thin and looked like an iPhone. They made a big deal over this, it had its own website. And it was very impressive, I had one. True 3d view including three dimensional terrain and buldings. Completely new user interface. There was a new 3d map browser that used the multi-touch screen to tilt and rotate the map. They continued refining this flagship model with the 3490, 3590 and 3597 and then just dropped it. None of the current models have 3d terrain AFAIK.
For the appearance of the main map screen, the biggest change came in 2013 with a different "flatter" look (apparently Apple-inspired) and tabs that slide open. I think this has been retained on the new "Drive" series.
Now the changes to the newest devices all seem to be based on a bluetooth connection to your smartphone, things like finding parking places, etc. The newest hardware does look nice, with big bright screens. Have only played briefly with them in the store. The problem is, the dedicated GPS is dying a slow death and their sales are way down. They will need to stand out from smartphones somehow. I suppose an obvious way is making 7" screens which would be a bit too large for a phone. ;)
Personally, I'm very happy with the Garmin StreetPilot Onboard app on my iPhone 6s+ which has a 5.5" screen. The user interface is very similar to a 2012 Nuvi, with some features borrowed from other models.
Regarding your question about which models will be supported... roll the dice and that's about the best way to forecast what Garmin will do. See the examples I cited above, they were all offered on Garmin's flagship models and announced with much fanfare only to vanish later with no explanation. ;)
So, just to be clear, do you have a file with a .gpx extension that you copied to the card? How did you convert the waypoints to a .gpx file? The card needs to be formatted as FAT32, which would normally be the default for a 16gb card. It could be a defective card, that is not terribly unusual.
Try copying the file directly to the internal memory of the 62s and see if that works. If not, then there may be something incompatible insided the file, there seem to be different "flavors" of GPX. I would try opening the file in Garmin Basecamp or Mapsource and see what happens, if it doesn't work there, then it may not be compatible with Garmin's implementation of .gpx You can open .gpx files in a text editor and see exactly what's inside for troubleshooting.
It shouldn't be necessary to "sync" anything. When the 62s starts up it should automatically read any data in a .gpx file on the card or in internal memory.
Interesting that they sell a version with lifetime City Navigator maps. https://buy.garmin.com/en-US/US/p/539722/pn/010-01607-05
I guess nobody would want to use it in the city though, and anyway it only costs $800 so what do you expect? :D