Thanks to everybody for their suggestions. I have been away for a few days but have been able to try some things and can answer some of your questions
Maps are ok, I copied them onto another older phone and there Primo works fine
I downloaded the HERE app to try, it is also slow to calculate speeed so maybe a bad GPS receiver?
I have now tried 483387, 468978, 431282, 331894 and 281004. Every time I cleaned the phone accordimg to Brown Dog's instructions. Also looked for and deleted any old extra files and folders every time.
I have tried on internal memory and external SDcard always with the same result.
Android 4.3 Jelly Bean, not rooted
The display position can be 200 0r 300 metres behind at 100 km/hr but is OK at slow speed in towns and villages
Android 4.3 Jelly Bean, not rooted
Phone was factory reset 2 or 3 weeks ago before first installing Primo
Do you know of a software I could use to check for electronic problems?
when I test different Primo versions I use only the map for my country
Mr Boki_Srb, I think your idea to try a different programme was a good one; Trying the HERE app has shown me the problem is with my phone and not with Primo. If you know of a program I can use to check the phone for problems please let me know.
Thank-you again to all who have contributed to this thread.
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