I did not wish to start some petty Satnav war.
Garmin units have been shipping with Version 9 mapping since last August time I understand, if you've had Navteq V8 maps on most Satnavs that use Navteq since then you have been sold old stock. AA Satnav were one of the first units to ship with V9 Navteq mapping that has been available as an update since around January to Garmin and some other users.
Quality of mapping does not just relate to address finding only, it relates to positioning and the points you get prompts.
Navteq as far as I am aware is still rated as a better mapping system than Teleatlas by most in the industry.
TomTom is inteneded as a comsumer based product I understand where as Garmin and some others are based on Industrial/Military based Satnav requirements.
Overall performance of Satnav mapping has Navteq as the market leader for overall performance.
From GPS review
"recent GPS Magazine product reviews (TomTom GO 910, Magellan RoadMate 3000T, Garmin StreetPilot c550), I mentioned that I prefer NAVTEQ's mapping data. That prompted some questions from folks wondering what, if any, there differences are between the two products.
NAVTEQ and TeleAtlas both provide mapping data to GPS manufacturers, online mapping services, and generally any other application that might need street-level mapping data. The conventional wisdom has always been that NAVTEQ is "better", but more expensive, and TeleAtlas not so good, but cheaper. Here is some more specific data:
In general NAVTEQ has more current mapping data in the United States. Want to see for yourself? Google Maps uses NAVTEQ mapping data, but Google's GMap Pedometer site uses TeleAtlas maps (no doubt the result of NAVTEQ's unwillingness to let Google use the open API).
Now Check out a view of the same area of New Jersey via Gmaps (using TeleAtlas data) http://www.sueandpaul.com/gmapPedometer/?centerX=-74.03115749359131&c... , then checkout the same map using Google Maps (NAVTEQ): http://maps.google.com/maps?q=hoboken,+nj&spn=0.015104,0.027479&hl=en
Clearly the NAVTEQ map is more up-to-date. Try it out yourself using your own address."
NAVTEQ is generally considered better, so why does anyone use TeleAtlas? No surprise here, TeleAtlas is cheaper. "
As a forces user I would trust my sources rather than other reveiwers as well.
James ( sorry for the delay in replying )