My 260 is way off on time of arrival by many hours.

The estimate arrival time is the time in that time zone so you'll have to adjust you time piece accordingly. If you have a cell phone, it'll adjust on its own within minutes once you power it up.

That is done on the flight plan, just list the time at the fuel / food stop and give an estimated arrival time.

I booked my flight to depart from (EWR) on Aug. 12, 2014 with Delta #2142 at 7:30 pm and by mistake to arrive at (CME) on Aug. 13, 2014 at 3:41 pm. I must change the destination or arrival information to (CUN). My departure information must also be changed from (CUN) on Aug. 17, 2014 to (EWR). The change is within 24 hours. I tried to reach you by phone but the office was closed please respond. Thank you very much.

Your unit is probably set for a time in a different time zone..... not sure on your model but if you can follow how mine works you may get to it....

I have to go to Tools..... Settings..... Time ...press time zone and make sure your time zone is selected

1. In the screen, select 'Where to?'
2. If you know the address, select address
3. Press 'Search all'
4. enter the address, then press 'Done'
5. Select any address shown that is close to the address you need to find, scroll down if necessary.
   
6. Press 'Go'

If you need to know the direction 'step by step' press the green bar on top of the screen. Scroll down to see the direction to your destination.

took it to best buy

When you have the screen showing up the route to your destination, if you touch the box down in the left hand corner showing the estimated arrival time the screen should switch to show your current speed, max speed, compass etc.........

thats normal- estimate is always higher the units go by speed limits and you shave time off trip units adjust accordingly

there is 2 things u can do... either try and reset the gps .. normally its by holding the power button down. or have u tried up dating your maps.. to do this u will have to jump on to the garmin web site and purchade from them... i know alot of ppl have trouble with garmin, i find that navman is the best :)

Click on SETTINGS, GENERAL, scroll down one, TIME, select time zone, and select AUTO for DAYLIGHT SAVINGS.