Is it possible to set the vehicle maximum speed for this device? The estimated time of arrival is way out for a HGV on UK roads. I have been through the manual but I can't find an option for manual input - this is a function that would be very handy when route planning and is a standard feature on some other truck sat nav.
This is a feature I lust for also, else ETA is meaningless.
Alas I have found no way of setting it on the Garmin, is seems like an 80km average for open roads, but it somehow adjusts for built up areas, so there is some speed algorithm in there.