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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...
Sorry, but alan is right. Garmin does not make any automotive models that can receive tracks. The Zumo is a very expensive way to get this capability. But if you don't care about the cost, there is also the Overlander and GPSMap276cx.
Now... depending on what you want to do, you might have a look at this little free program. It can convert your tracks to transparent Garmin maps (.img files) that you can overlay on another map by enabling it at the same time. This should work on any Garmin automotive device, such as the Nuvi and Drive series.
Here's another similar program that is not free. But it's a lot cheaper than a Zumo. ;)
@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. :)
Dedicated GPS devices are a slowly dying product category. It has been going on for many years and no doubt will continue until the inevitable end. :(