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It could be the setting on your gps or the cable could go bad. (Mine did) To test the cable - Instructions from Magellan FAQS - With PC data cable still connected to the unit power ON the unit and press both the ?Power? and ?Zoom Out? buttons at the same time and hold them down for two seconds. The following message appears: ?Test Serial Port Press Enter?. Do not press the ?Enter? button yet. Next, use the paper clip or jumper wire and insert the ends to Pin #2and #3. Pin #2 is the NMEA Positive (TX+) Transmitter; #Pin 3 is the DBR Positive (RX+) Receiver. While performing the cable test you will see a series of check points in each individual Baud Rate point. 1200, 4800, 9600, and 19200. Each point should display the message ?OK?at the bottom. If the user sees the initials ?NG? (NO GOOD) perform the test again. If the test continues to display the message ?NG? the problem may be due to a bad cable. When the cable test is finished press the ?Power Key? to power off the unit.