Asus P535 - Manual (Page 61)

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6. Tap the name of your Bluetooth-
enabled GPS device then tap Next.
7. Select SPP Slave in the Service
Selection list then tap Next.
8. Tap Finish.
9. Tap and hold the shortcut icon to
display shortcut menu then tap
Connect.
10.In Passkey, input the alphanumeric
passkey of your device then tap OK.
You can find this in the documentation
that came with your GPS device.