I have three GPS gadgets and still I sometimes get lost. I’ve come to ignore the traffic re-routing on my Garmin nuvi 670 more often than not as it appears to be outdated info (a few times I took a detour between junction 5 and 4a of the M3 and, while enjoying the countryside, noticed that the M3 was moving just fine when I went over it later).
My oldest GPS device is a Garmin something or another from the late 1990’s. It is hand-held and shows a blank screen with just a X in the middle. No maps. So, unless you like watching pixels (bread-crumb routing) and know your longitudes from the latitudes, its not much use. But it was cool at the time I bought it. There is no way, either, to get the data off of it.
A 2008 Christmas present, a Garmin Forerunner 305, is meant for tracking your exercise. Me? I used it for geotagging my photos. Now redundant given the GPS in modern mobile phones like Samsung S6.