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[The Red Baron]

Quote: Originally Posted by CFCZeek (original)

To begin with yes, but if you set a journey which is solely 75 miles of motorway, and set off now, it will set an ETA an hour from now. If you sit in the left lane of that motorway and do 20mph (please don't!) the ETA will change sharpish!

Of course it will but not in the way your thinking..

Example:

If your traveling along a 10mile section of road at 60mph (set of at 8am) your ETA wll be 8.10am
However if after 1min you break down it assess that you've still got 9 miles to go or 9mins in this case, and for every minute your sat there you'll add a minute to your ETA.
Alternatively if i half my speed for the 1st mile to 30mph (the first mile will take 2minutes) and the sat nav calculates that the next 9 miles will only take 9 minutes giving me an ETA of 8.11am (ie i loose 1minute for every minute i half my speed).