A:AnswerThe device has a 3-axis compass with automatic calibration. No application is included that shows the compass but there are many free widgets that you can download. I recommend Compass and GPS Heading widget by FlipStone that gives you compass, plus speed, plus altitude, plus coordinates, and local time.
A:AnswerIf you exceed Bluetooth range between your watch and your phone you'll see this message until the devices are in close enough proximity to re-establish a connection.
A:AnswerBelieve it uses both, as do many of these type of watches today. I personally do not wear it to sleep. I can say it is much better than the Fitbit Blaze I bought a year ago.
