482. Check Enable COM Port NumberAfter you install GPS USB driver, you should know whichCOM port is available, and check enabled COM portnumber.You need to know the COM port assignment for the GPSreceiver, when configuring map or chart software. Pleasenotice that this remark is very important; if not confinguredproperly, the mapping software will not communicate withthe GPS receiver.TO check your assigned COM port for the GPS receiver,please follow the instructions below.Step 1:Check enabled COM port number by clicking "Start" ‹clicking "Control Panel" ‹ double-clicking "System" icon