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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...
There's Garmin's legacy program, Mapsource, that was discontinued a number of years ago. It will use the same maps that are already installed in Basecamp. It's worth a look, but if you are looking for something "intuitive" then you may not be impressed. :) https://www8.garmin.com/support/download_details.jsp?id=209
Also "Tyre to Travel" which was originally a shareware program that only worked with TomTom devices, but the new version also supports Garmin. www.tyretotravel.com
@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. :)
Good for you John! I still have my Nuvi 5000 but don't use it anymore. My Grandmother was 97 when she died back in 2000. She lived by herself in the same little house in a small town and drove her 1962 Rambler right up until three days before she died. Never used a GPS though. :)