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A look at my old Garmin StreetPilot-III GPS, the various accessories and installing the latest OSM topo maps on it.
Note, you don't need to update maps all that often. Only if you have a lot of new roads or businesses opening up to make the routing information outdated, would it be necessary to update a map. I think the GPS will pop up a warning if the maps are more than a few years out of date. The other time maps would need updating would be if you need to load a different area. I generally keep one card loaded with road maps and the other one for specific trips and topo maps.
I made good use of the BlueTooth transmitter to connect the GPS to my laptop running MapSource. When you connect to the GPS unit, the MapSource program picks up your current location and shows that on the map. This makes off-road navigating a lot easier because you can zoom out much farther on the laptop display. This lets you see where you want to get to and which roads to take to get there. At that time, I was using Garmin's 100K US top map set that wasn't routeable.
It looks like the write speed for the Garmin 128MB memory card is approx. 90KB/s and the read speed is around 150KB/s via the USB Data Card Programmer. Via the RS232 serial port, you would be looking at 10-12KB/s with the 115,200 baud rate. For comparison, a decent SD card is in the 30MB/s write speed range.
Note: Reading/writing memory cards requires a 32-bit system and the MapSource program. I don't recall if I ever got this working on Windows 8. Also, when writing to the memory card, the program erases the card prior to writing the new files. So there's no "incremental" updates. This is why you should create and save a "map set" of the data you want to upload. This way, if you can open up that map set and add / subtract items in it if you want to change what's on the memory card. You can't access the memory card as a drive like you can with the newer SD card based units.
Garmin USB drivers:
support.garmin...
Garmin MapSource:
www.garmin.com...
Open Street Maps for US:
www.gmaptool.eu...
Some good device information:
www.tramsoft.ch...
Data connector pin-out:
pinouts.ru/GPS/...
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And as always, thanks for watching