How Many Standalone GPS Receivers do you Own and How Often do you Update Them?
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    17 years
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Not including smartphones or GPS enabled devices, I own 23 GPSr's, mostly Garmin. Many of them harken back to the days when I bought & sold on eBay.
I regularly use 8 newer devices for automotive, handheld & marine use, and update them once per year. A couple I keep for antique value, like the GPS II+ and GPS III units from the 1990's.
For whatever reason, the majority of the collection sits on the shelf. Their relatively low resale value isn't worth the effort. I'll occasionally use one of the older units, that will pass through raw GPS data, to feed another device like an iPad or laptop.
I have done map updates on many but not regularly. So far, I haven't had a problem with updates on discontinued devices, but none are older than 8 years or so.
Three
…relatively old devices, only two of which are eligible for updates. The two eligible devices, (1) 265WT and (1) nuvi 2689 are updated shortly after an update becomes available. Each device also has (2) memory cards, one of which holds the prior map version.
John from PA