This is the system in question in my C5 X7, but there is a similar one installed in some Peugeot vehicles ...
I got in contact with 'Here' maps, formerly Navteq, who make the maps for many of the automotive companies including the PSA group. Here is an extract ..
I have a question concerning the Citroen C5 NG4 Navidrive 3D maps / firmware concerning Postcodes. I already have the latest firmware and 2015-1 map update and was very disappointed to find that we are STILL unable to use 7 digit postcode mapping in the UK for this system. Peugeot / Citroen systems with the RT6 system and firmware 2.80+ with the latest maps can now enjoy 7 digit postcode mapping - which should be the norm. As you supply the firmware along with the maps for the NG4 Navidrive 3D system, I would like to know when we can expect this same functionality? Presently in many rural areas, the 5 digit system is hopeless as 5 digits are not specific enough especially if you do not have the lane or street names making it very difficult to navigate.
The bog standard response was:
Thank you for your enquiry.
HERE Maps are used in many of the navigation systems on the market. The navigation system function you mention is a function of the navigation system software supplied with the hardware and is not a function of the map data. Please note that each automobile manufacturer has made choices on the functionality that they wish the navigation system to support. We kindly recommend you to contact your dealer about this issue.
To which my response was:
Thank you for your prompt response to my query.
I have indeed already been in touch with Citroen UK and am awaiting a further response. Can I therefore assume that the data contained in Here maps does contain UK 7 digit postcode data?
I am aware that the RT6 System fitted in some PSA vehicles as of firmware 2.80 does support 7 digit post codes, so would assume so – but I would like clarification for the maps supplied for the NG4 Navidrive 3D system please, so I can confirm this with Citroen UK should this matter arise.
This was the answer:
Thank you for inquiring about HERE Maps.
Only the RT6 and the Touchscreen systems support the full UK postal codes when the software is above version 2.80. All other systems do not support this function. Should you require additional information, please send us your feedback by replying to this email .
With kind regards,
HERE Customer Service
PO Box 501
7300 AM APELDOORN
I won't list the correspondence I've had back and forward with Citroen UK Customer Services here, suffice it to say that I'm waiting a further response other than "...have a chat with your local dealer..."
So there seems to be a lot of batting back and forward between the the mapping company and PSA. It is my understanding that apart from the UK, only Japan used 7 digits for their postcodes and as this system has been replaced now, I think it unlikely they will provide a system firmware / software update to correct this, so it looks like we are stuck with 5 digit search at present. We know it can be done as per other systems, and should of been a standard function from new, so I'm not holding my breath on this!
Such a shame as the system is brilliant in so many other regards:- Bluetooth (including SIRI through the audio system if you have an iPhone), Plays DVD Movies, MP3, WMA files, Voice Commands, Hard Drive for media / Jukebox Function, SD card support for Media, 3D mapping, Speed Camera Alerts, Internal GSM Phone with Text Messaging, SOS Emergency Assistance and Breakdown etc., but let down by the post code issue.
On another note, the latest version of the maps are out now for those interested (GPS Map 2015-2 Edition). I'll have the update in a few days and will post back if there is a new firmware update included as there was last time