Thanks for quick reply! Yes, the new Extreme Pro is FAT32, so it's just too new/fast for my ancient TT it would seem...

I'm afraid it's most likely

So need to stick to Class 10 max it would seem and don't go for any of the newer/faster ones. I was hoping 95MB/s read speed of the Extreme Pro would see my old TT whizzing along... not to be

I'll do some more testing with the slower 32GB card I have and see how I get on.

Thanks again

Just use an ordinary SDHC Class 10, I've used Class 4 also and to be honest, I didn't see much difference
Maybe it possible to measure, but most of the time the speed was just enough also when the device has to find an alternative route when you missed an exit

Success! Slower 32GB card, bootloader 5.5128, NavCore 9.510 and currently just a UK & ROI map to play with, but will install some of the larger Europe maps and see how it affects performance etc.

Thanks all for your help and answering my numerous questions, very much appreciated!

For future reference, my TT One v3 on NC 7.903 & bootloader 5.5128 is ok with a SanDisk Ultra Class 10 U1 32GB SD card with 80MB/s read speed. So it's just the SanDisk Extremes that it was unable to read.

Many thanks for the feedback and a happy drive with your brand new toy

So, the maps with a lower size have less detail? or are they just better compressed?
because all the newer versions seem to be smaller in size....

Less details and/or less posibillities, for instance no Advange Lane Guidance

thanks for the fast reply and clarification.

will go for the bigger sized maps then.

Which device do you own ?