I have a 62 plate Nissan Note. The sat nav has worked okay until today. My estimated ETA when i started the journey was 10.30am but bizarrely changed itself to 02.45, which reduced to something like 00.50 by the time i arrived at 10am!! For the return journey it set an ETA of 03.30. Bearing in mind this was 12 noon for a 2.5 hour journey, it was wrong. Any ideas? Would a reset solve the problem. There seems to be no correlation between actual time and the ETA.