Reference
Notes on Holding Your Tablet Device
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In landscape orientation, hold your tablet device so the front camera lens is at the upper side.
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In portrait orientation, hold your tablet device so the front camera lens is at the left side. Be careful not to hold the ambient light sensor.
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Some apps may not support screen rotation. Some apps may rotate the screen in reverse.
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Be careful not to hold or cover the antenna shown in the figure below while using the Wi-Fi, Bluetooth, or GPS functions.
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Wi-Fi / Bluetooth
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GPS
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