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I would be very surprised if an external antenna makes a difference. In the consumer world, antennas are typically only used when the device is inside a vehicle that has obstructions. The 60 series (GPSMap 60/62/64) has a quad helix antenna that many people feel is the best in the business already.
Tim's point about expectations is right on target. Consumer devices like the 64 are not likely to give you any better than +/- 5 meters regardless of what you do. The very expensive antennas you have seen are probably intended for use with specialized survey grade gps units that cost thousands of dollars. In the consumer space, spending more money is not likely to give you more accuracy. A ~$100 device like the eTrex 10 is going to be just as accurate as the ~$700 Monterra. Spending more money just gets you more "bells and whistles".
To get the best accuracy with your 64, use the "waypoint averaging" feature. If you stand stationary, the device takes a position fix every second and averages the results. This usually gives better accuracy, but there are a lot of variables such as the position of the satellites at the time you take the measurements.
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.
You could check with this company, they repair out of warranty devices. The owner is a member here. http://www.sharc.net/gps_repair.htm
But you really have to ask yourself whether it would be cost effective, since new devices have gotten so inexpensive...
Many people think that Basecamp 4.7 is especially buggy, so you might want to try an older version. But Garmin has discontinued Basecamp, so any problems that it has will never be fixed. X( And there's a major issue with the current version, MapInstall doesn't work with third party registry-based maps. This includes almost all of the maps from GPSFileDepot.I
Don't know what to tell you about BaseCamp crashing. Are you using the latest version (4.7.0)?
You can download old versions of Basecamp here: http://www.gawisp.com/perry/mapsource/
@Zemartelo - with all due respect, this thread is about wifi problems on the DriveSmart 61. Search problems on the DriveAssist 50 are certainly worthy of discussion, but they should be the subject of another thread. :)
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.