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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...
The FM coverage is very poor, you will only get it in major cities. I live 50 miles from Philadelphia and used to commute daily. I could not get any traffic data until I was about 20 miles from the city, which was too late to make a major change in my route. There are large areas with no coverage along the NJ Turnpike, even when you are close to NYC.
I don't think there's any list of what stations offer it, and that's not something the user is supposed to even know about. The device should automatically lock onto the strongest signal (if any). If you go into the developer settings, I think it will give you some data about this, but I haven't looked for awhile. The method for accessing this varies by device, on some of them you need to go to the volume screen and hold your finger on the top right corner. On other models you hold your finger in the middle of the speedometer in the trip computer (IIRC).
The traffic data comes from HERE (formerly Navteq). At one point Garmin claimed that it was augmented by data they receive from users with the smartphone link app. Not sure if that is still the case.
IMO, the FM traffic is useless if not downright misleading. I stopped using it long ago.
@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.