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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...
It will not seem strange if you become more familiar with the technology. Garmin's handheld devices are accurate to within about +/- 5 meters (16 feet). And Garmin claims +/- 3 meter (10 foot) accuracy for the GLO. Think about what these numbers mean. If you go to a marked location and record your position two times, those points will (theoretically) be within 5 meters of the true location. However, one of the points could be 5 meters north of the actual location, and another could be 5 meters South. So, the distance between two points recorded at the exact same location could be 10 meters (33 feet) and the GPS would be within its specifications. You can see this graphically in the image I posted (and the thread about accuracy I linked to).It seems a bit strange to me that it cannot be more accurate though!
If you are trying to map a trail that is only 1 meter wide, that is a huge error. But, such are the limits of consumer devices. None of them (including the GLO) were designed for making precise maps of small areas. Want more accuracy, no problem. SXblue makes some nice bluetooth receivers with sub-meter - or even centimeter - accuracy. Cost is in the $3000 to $7000 range
Trimble is considered the "gold standard" for highly accurate GPS receivers. Expect to pay in the same range, although you may find some in the $2000 range.
These are professional tools where no trade-offs have been made to keep the price low enough to appeal to a mass audience. There are other bluetooth receivers in the consumer space you might consider however, such as Bad Elf
I considered these two companies when I got my glo a number of years ago, but felt they did not offer any advantages at that time. Things may have changed today, so you might want to do your own research.
@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. :)
I am writing all my own code for the user interface and other functions, which is big project. My app and website(s) are free, but they are not open source. Sorry, I am not interested in sharing the code. Anyway, I don't think this is what you want. My main interest is in making maps, specifically maps of my own region and the app is an easy way to share them without the user needing to download or install anything. In the future, I hope to reach a wider audience with maps of other areas.
Good luck with your project!
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. :(