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This may help: https://support.garmin.com/en-US/?faq=i34WV8maJa11t7iwvYnz18
It has nothing to do with the maps. The FM traffic is limited by a very slow data rate - similar to an old 300 baud modem, if you're old enough to remember those days ;) It piggybacks on selected regular FM radio station signals. So there just isn't enough bandwith to provide much data, and it is therefore limited to major roads in your immediate area.
The newer HD traffic still uses FM radio signals and also has a slow data rate, but faster than the old FM system.
The smartphone traffic uses a "real" data connection that can deliver much more data that covers a larger area.
Happy to help. :)
And shame on Garmin for not fixing this major bug that has caused so much trouble for the past 11 months. X(
Did you use the current versions of Basecamp and MapInstall for WIndows? Basecamp 4.7/MapInstall 4.2 were introduced in May 2018, and they do not work correctly. MapInstall will not send a map to your GPS properly, the results are pretty much as you described.
Of course, something else could also be wrong, but if you used the current version of Garmin's software, then it just isn't going to work. Garmin doesn't really seem to care about this, because the problem is well-documented, yet they still have not fixed it. Garmin has announced they have ceased development of Basecamp.
So your only options are to install an older version of Basecamp/MapInstall or else use Garmin's older Mapsource software, which still works properly. See this thread at GPSFileDepot for more information.
I think your recollection is faulty. :) Maps that are sold on pre-loaded SD cards can be used in any device - that is their advantage. The copy protection ties the map to the hardware ID of the original SD card, so it cannot be duplicated.
Downloaded maps are tied to a specific device. The way this works, you must connect the desired GPS to your computer before you can purchase a downloadable map from Garmin. This is how they associate it with your specific device. After purchasing the map, it can then be used on any SD card or internal memory. But only on the original GPS that you used when the map was purchased.
I disagree. Garmin's automotive devices no longer use "routes". That terminology was abandoned many years ago when Garmin introduced the "trip planner". But this all gets very confusing, because handheld GPS units still use "routes". And handhelds also record "track logs" but automotive devices call these "trip logs".Minor technicallity, routes are the route you plan to travel, trips are a record of where you have been stored in gpx format in the "current" file on your GPS.