nüvi 800 Series Owner’s Manual Playing Audio Through the Vehicle’s SpeakersFrequency Selection TipsFor best results, select a frequency below90.1 FM.When searching for an appropriate FMfrequency on your FM stereo, look foran unused frequency that has steady,consistent static. If you hear slight noisesand sounds in the background of thestatic, select a different frequency.As you travel, you might need to changethe frequency for the FM transmitter.A frequency not used by a radio stationin your area might be used by a stationelsewhere.FM TransmitterInformationThe FM transmitter is intended totransmit nüvi audio to your FM stereo.Do not adjust your FM settings whileyou are driving your vehicle.The distance between the vehicle powercable, the nüvi, and the FM stereoantenna might also affect the noiselevel. Vehicles with antennas located faraway, such as a rear-mounted antenna,might experience more interference fromoutside noise sources than vehicles withfront-mounted antennas.As you drive, you might notice changesin the background static even thoughthere is no FM station using thatchannel. You might notice this as youdrive through intersections where certainkinds of traffic lights or other municipalelectronic systems are operating. Youmight also notice this effect when theterrain changes, allowing distant stationsto be received by your car stereo thatwere not received when you made yourinitial frequency selection. These andother sources of electrical interferencemight make it necessary to look foranother frequency.