Hi Andy,

How can one be sure of a good ETA ?
If you are driving in a city that is impossible!!!

However since i am doing a trip computer for trucks i have to assume that most driving is done in highways where most of city traffic problems do not apply.

I will provide both ETA and TTA in its simplest form which is not that bad.
I need to fill my display with something :-D

I already have a calculated average speed over a time window of 30 seconds which can be easily adopted for more time. I believe that is not bad, is it?

Thanks,
Panos Kenterlis