Kona said:
In the discussion about this guy's boat, a friend informed me that one of the first cars that had decently functional navigation in it was the Mercedes model that Princess Diana died in.
Not true. Honda, believe it or not, offered the first in-car navigation system in 1981 called the Gyrocator. This was NOT a GPS-based system - it used inertial navigation via gyros (hence the name) - but offered the first map-based system in a format we've become familiar with.
This video has no audio, but you get the gist of it...
Japanese, not Europeans, were the true pioneers of this technology. Throughout the late-80s and early-90s, they rolled out true GPS systems on highline models like the Toyota Crown, Celsior, and Soarer, Mazda Eunos Cosmos, and Mitsubishi Debonair.
BMW, not Mercedes, introduced in-car nav with the '94 E38 7-Series - the first of the Europeans. We Americans followed the next year in '95 when GM debuted GuideStar, - a portable-style unit that plugged into your cigarette lighter and offered turn-by-turn directions - available as a dealer-installed option on Olds Eighty-Eights and Bravadas for $2000(!!) + $400(!!) for each map cartridge.
The '94 Aurora show car has the layout we're familiar with today, with modern center console controls to boot...
...but the production car didn't feature the system.
Mercedes didn't introduce in-car NAV until COMAND debuted with the W220 '99+ S-Class and CL coupes