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Posted: Sat Jul 08, 2006 8:37 pm Post subject: over 200,000 incorrect postcodes
I was dismayed to find the CoPilot Postcode database has hundred of thousands possibles errors. I started studing it because my home postcode and over 200 others in my town are all in exactly the same location. When I checked there are over 440,000 postcodes with duplicated locations. I know that some locations have multiple postcodes but this seems very high. I have reported it to AKL and guess what they say they are investigate my claim. They have been investigating it for 16 weeks now without any other comment.
My warning to all users to check the location of the postcode before you set off.
From personal experience I knew the situation was bad - I just didn't realise that it was quite as bad as that.
Have you contacted ALK about this? From personal experience I know that they are interested in hearing about the postcode errors. They buy the data in, so I presume that they are not happy about the poor (I am being polite) quality of the postcode data.
Hopefully, if it can be shown that there are so many errors to make the function of little use, we may be able to get a free patch to correct the problem.
I once had the oportunity to try out Destinator 5, which also uses Navteq data, and with the (admittedly limited) examples I tried, the results (or lack of them) in both applications were identical. Now I am not 100% sure, but did I read that the proplem has been fixed for Destinator 6, if so, it would appear that Navteq have now fixed the problem.
Joined: 03/05/2003 14:45:49 Posts: 3999 Location: leyland lancs ENGLAND
Posted: Sat Jul 08, 2006 10:32 pm Post subject:
i have to admit that is not put me wrong yet as is accurate as tomtom iGO and medion,and my garmin i3 _________________ currently using aponia truck navigation on windows phone. Good bye IOS don't let the door hit you on the way out .
Oh the joys of being a courier.
device Lumia 950 xl
Yes I have reported it to AKL and to Navteq. Navteq claim it's not their postcode database, they only supplied the maps. However AKL say that it is Navteq postcode database !
Both have had the list of postcodes who's location are duplicated, for over 16 weeks.
I keep asking AKL to comment but the only say "they are investigating the claim with their postcode provider".
They have hinted that they do not issue patches for map or postcode errors.
Just to give you all an idea of the size of the problem:-
The postcode database has over 1.5 million entries over 440,000 postcodes have duplicate locations. Although I am sure that some of these duplicate locations are correct, I know that not all of them are correct. Out of my normal address book, I have a failure rate of 20%.
I am sure that other device all have their faults. I think any device that has the NAVTEQ postcodes will have the same problem.
I am very dis-appointed the AKL are not taking this problem very seriously.
Maybe a bit of bad publicity and they may get off their .... and do something about it.
Just for the record, more than half the postcodes I have wanted to use have been out by a few miles in CoPilot 6. They have been reported to ALK as they have come up.
Some of these cases were for addresses I know well, for others I now check against Multimap or AutoRoute 2006 before relying on the location given by CoPilot. A few wrong postcode locations have also turned up in AutoRoute 2006 so I have also reported them to MS.
Interestingly, all the postcode location failues I have found have been in rural areas (but then perhaps most of our CoPilot-guided journeys end in rural locations!).
John _________________ CoPilot Live 7, Fugawi Global Navigator, Pocket Streets, iPAQ 5550, GlobalSat BT338 GPS, Brodit Powered PDA mount, Jabra BT250 headset.
...Out of my normal address book, I have a failure rate of 20%.
I am sure that other device all have their faults. I think any device that has the NAVTEQ postcodes will have the same problem.
I am very dis-appointed the AKL are not taking this problem very seriously...
I am not getting a sucess rate of 80% - nowhere near. Admittedly I used quite a small sample (10 picked at random) but even though all the addresses were over 10 years old 6 failed to find the exact postcode, but the 4 which did, reported a list of other streets in addition to the correct one, one listed so many, that I had to scroll down to select the correct address. Additionally, out of the 4 which did find the correct street, the position on the map wasn't always spot-on, and one was even in a nearby street (my home).
My quick test with Destinator 5 where the 'failures' were identical would back up your premise that all Navteq products are affected. But possibly only the ones from around the same time - possibly only one or two issues of the data. Perhaps someone using Destinator 6 will be able to say if the situation has improved.
As for ALK not taking this problem seriously; after having spoken with them about this and other matters over the phone, I was left with the distinct opinion that they are taking this very seriously.
Joined: 03/05/2003 14:45:49 Posts: 3999 Location: leyland lancs ENGLAND
Posted: Mon Jul 10, 2006 1:50 pm Post subject:
neil dont forget that a postcode can cover a considerable area at times as well as only one street _________________ currently using aponia truck navigation on windows phone. Good bye IOS don't let the door hit you on the way out .
Oh the joys of being a courier.
device Lumia 950 xl
neil dont forget that a postcode can cover a considerable area at times as well as only one street
Definately not so in the cases I looked at, where each surrounding street has its own unique postcode.
I have heard many times that postcodes can cover a considerable area, but when I was postcoding addresses for computer systems, I never actually came accross any. And yes, it was as mind-numbingly boring as it sounds, and left me with an ability to hear a town and know the first four digits of the postcode for many years.
Unfortunately, so far, noboddy has been able to come up with any specific examples (and have I asked for them) which I would really like to have for testing purposes. I am even starting to wonder if this is an urban myth, or something which no longer applies.
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I was dismayed to find the CoPilot Postcode database has hundred of thousands possibles errors. I started studing it because my home postcode and over 200 others in my town are all in exactly the same location. When I checked there are over 440,000 postcodes with duplicated locations. I know that some locations have multiple postcodes but this seems very high. I have reported it to AKL and guess what they say they are investigate my claim. They have been investigating it for 16 weeks now without any other comment.
My warning to all users to check the location of the postcode before you set off.
