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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...
Sounds like a good project and I hope you get some responses. But I think you have come to the wrong place. For starters, there is very little activity on this site anymore. Beyond that, when someone does come here it is generally to ask a question like "how do I update the map on my Garmin GPS?" This has always been a consumer-focussed site, and not a place to discuss complex technical topics. :)
And before you ask... no, I have no idea where you would find a site to discuss this kind of thing, sorry.
@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. :)
That compliment is well-deserved. However... Garmin had the StreetPilot app for iOS which was basically the same as the DriveSmart or Nuvi. So what did they do? They discontinued it a few months ago. My app still works on my phone, but if I decide to update to the new version of iOS, I'm sure it will be gone. I wasn't able to install it on the new iPad I got this summer either.
So... thanks for nothin' Garmin. X(