Holux GR-239 - Manual (Page 4)

3. All wireless communication products, such as mobile phones and speed
limit warning systems will interfere with the communication satellite and
will affect signal reception.
4. Before you setting, while the car is stationary, ensure that you have
searched for and fixed your position using the positioning function.
5. For further information, please read the user’s manual in the supplied CD.
6.GR-239 PASSKEY – 0000
(For security, some PDAs will prompt users for the GR-239 Passkey)