Yes, it tells it very well lol. I haven't had to reset it since I bought it last Dec. It also gave me almost exact ETA for my trips to Louisville and back(which btw I will never be making again, broke up with my g/f, but, I digress.). It works REALLY well if you are going to be flying, which occasionally I get to do. You can figure your ETA, Gas usage, time to decend, time to ascend, ascent speed, descent speed, oil usage, conversion from MPH>KM/H>Knots, and interchangeably. 3 alarms that can be set for diff time zones, good stuff

OH, it even adds, subtracts, multiplies, divides, and does percentages, as well as square roots.