Technology

The over-speed warning on my 2016 Nissan X-Trail does not activate until the speedo (analogue dial and digital readout) shows 10 km/h over the posted speed limit.

The only adjustments available through the driver-options in the navigations system are to increase the margin – up to a further 10 km/h (i.e. the speedo would then be reading local limit plus 20 km/h).

Have had a firmware update but it did not correct it. Since the firmware update and a new version of the maps software were installed, the only time at which the local speed limit shows up on the on-screen map is when the speedo is telling me that I am 10 km/h over the local limit.

Am I reasonable to expect a speed alert system that activates when the speedo reads that I have just reached the local limit (notwithstanding allowable errors in the speedo calibration)?

The original selling dealer performed the firmware and maps software updates and has informed me that Nissan Australia say it is "normal operation" and it cannot be corrected.

I have an open technical enquiry with Nissan that has not been answered to this point.

Should I also expect that the maps software to always show the local speed limit?

My wife and I own a 2007 Mercedes-Benz CLS 350 and a 2010 ML350. The sat navs on both cars are out of date and Mercedes have said they cannot be updated! Is there some way to get it done? It is so frustrating to own a prestige mark, but cannot use sat nav to get to many places.