92NAVMAN iCN 620 user manual14ýACCESSORIESA number of accessories are available for the iCN 620 In-Car navigation unit.External or Re-radiating AntennaeGPS signals are mainly transmitted through the windshield, and to a lesser extent, the side and rear windows. If yourvehicle is fitted with an athermic (heat reflecting) or a heated windshield, GPS signals are not able to pass through thewindshield, and therefore the signals getting to the unit are greatly reduced.There are two options available to ensure that sufficient GPS signal is available to the unit: External antenna this antenna is fitted by a magnet to the outside of your vehicle. They are generally installedon the roof or the boot. The cable attached to the antenna must be plugged into the side of the aerial on the iCN620 unit. The cable may be threaded through the boot into the vehicle, or through a window. Re-radiating antenna an alternative to the external antenna for vehiclesfitted with athermic or heated windshields, or for extra GPS performance inweak signal areas.
