[aprssig] Anyone reality checked Navteq/Google maps?

Drew Baxter droobie at maine.rr.com
Thu Jul 21 12:35:00 CDT 2005

Navteq reindexed Penobscot County Maine in mid 2004.  You'll find 
K1XVM's findu page is 'off the road' by 1200 feet using the APRSworld 
data.  I reported this to Navteq, GDT, Delorme, and to Garmin.  It's 
a situation where they used Tigermaps and the folks at the Census 
imported my road with an incorrect datum, that's my belief anyway.

Needless to say, the latest version of the data from 2004 has me ON 
the road in Delorme SA2005 and Topo USA 5.  It should be correct on 
Google maps.  Delorme also has our new interstate exit numbers and 
the new exit that was added a year or two ago up here.  The data is 
definitely getting better.

A friend of mine in NJ has found his data is upwards of 12 years+ old 
in some places, roads don't exist or don't complete anymore, etc.

It varies from area to area.

By the way Delorme SHOULD be correct here, seeing as they're based in 
Maine and whatnot. :-)

--Droo, K1XVM

At 01:29 PM 7/21/2005, KC2MMi wrote:
>In this area (NYC) it appears that the Google Maps, and FINDU and anyplace
>else using the Navteq mapping, give my location incorrectly by 0.16 miles,
>two city blocks off real WGS84/USGS/GPS position.
>I've asked Google and Navteq for a response on this. They may be using the
>TIGER maps for their baseline data, or making the same incorrect assumptions
>that TIGER did. The US Census knows of this error, and states that TIGER
>maps are not suitable for navigation.
>Has anyone else done a reality check on the Navteq maps and found similar
>problems in this or other areas? Does anyone know what the source for the
>Navteq data really is?

More information about the aprssig mailing list