I have had very occasional problems with Columbus in the past and have responded about them in other threads. I now seem to have a longer-lasting issue. On my way to do some work on Sunday evening, for an overnight stay in Durham, my satnav had me allegedly driving off-road somewhere in rural Lancashire. I assumed it would have corrected itself by Monday morning, but when I switched it on, it was still telling me I was somewhere in the Trough of Bowland. On Tuesday morning, it actually located me in the car park of my Durham hotel and apparently gave me my route to where I was working, but as soon as I began to drive, it had me off-road again, and this time apparently somewhere near the east coast! It continued with this fiction all day yesterday. I'm about to go to Leeds in a couple of hours and will try it again then, but I've never had this apparent memory-lapse for so long before and am concerned that there is a significant (and potentially expensive) problem. I'm not aware of any deepseated reset process that you can carry out on the unit.

Any ideas from someone clever in this brilliant community?

Try pressing and holding the setup button. This will initiate a soft reboot which may be all it needs? Good luck.

Try the soft reset procedure:

Hold the < and > buttons (Top left of unit) and the i button (top right - may have changed to a microphone symbol on later models) simultaneously. The unit should reboot.

Good luck

Thanks to you both. I'll go out and try this when it's a tad warmer!

Have tried both of the above. Post #2 suggestion - nothing happens! Post #3 idea - unit shuts down, lots of whirring before it starts up again, so clearly some kind of reboot is happening: but no solution to the problem; instead of showing me at home, the map has me in the middle of nowhere (and when I try putting a route in, eg to my daughter's home, which 210 mileas away, it tells me I am 253 miles from it!).

Anyone else with a bright idea?

My best guess is that you need a new GPS aerial - unless the GPS aerial connection has come loose.

Edited 17 January, 201313 yr by bgw

With the map displayed, press the 'Map' button to bring up the split screen mode.

Tap the header bar in the 'window' that appears, scroll down and select the last option in the list (I can't recall what it is called).

This will show you how many satellites it can 'see' and how many it is 'tracking'. Less than 4 (in my experience) and you won't get a 3D fix.

Mine went through a phase of not tracking the car's movements properly and it turned out to be a poorly seated connection on the GPS FAKRA lug on the back of the Columbus.

As above, I suspect poor reception of the GPS signal caused by a loose connection or a failing GPS antenna.

I'm no electrician, but have you introduced any electrical or physical items into the car that might be causing the GPS signal to be shielded or disrupted?

Thanks again for this advice. I'm inclined to take it into the dealer next week, although it's a 70 mile round trip from here - the perils of living in the countryside!

Try a few checks first as it could help identify the problem first and might save you the petrol and time and money.