The device works effectively on 3AA batteries.
By entering the latitude, longitude, elevation, local time and date one is able to initialized the receiver.
Yes, this unit can work off of external power, however, batteries are still required for memory purposes.
The receiver has the capacity to store a maximum of 200 landmarks.
A GOTO route is a movement from where the user is to a designated landmark selected by the user.
It means the batteries have an estimated 20 minutes of power left unless the light is lit, in which case, there is considerably less.
Yes, the device calculates sunrise/sunset and moon phases according to your geographical position and date set.