Nav updates can be a waste of money - unless minor road construction shuffles ALL your freeway exits - often by a matter of a couple blocks. Just try navigating an unfamiliar freeway where your exit isn't there. There's nothing more useless than a map that's out of date. I don't care what it cost, that last update I bought was worth
Didja ever notice how those GPS maps made from aerial (or satellite) photos often conceal critical data? Like the Lexus maps that for years concealed a freeway entrance because the angle of the photo hid the presence of an access road alongside? Yup, that brilliant map (and a couple of its successors) would have had me executing a two-mile detour to get on the 610 Loop, when the direct route was easily visible from ground level.
The latest TomTom maps seem to be based on Google Earth - showing in one instance a clearly visible paved road about a half mile in length connecting two thoroughfares near a local hospital . . . it's NOT a road, but a muddy cattle track across private land, and enough people got stuck out there that the landowner put up fences across the stubs of pavement that seem to enter his property.
Ten years ago when GPS was in it's infancy I followed a farm road in Wyoming using my much-loved Street Atlas by Delorme on my laptop . . . only to end up in front of somebody's home, miles from any other feature. The road was a dead end . . . because it was a very long driveway. You'd think the house and barn had
to be visible in the aerial photo.