Many problems seem to come up when people try to connect their GPS units to the TH-D7. Many of these problems can be solved by checking out the following.

• You have pushed the TNC button on the D7 so that a block around TNC is on the display. (Not TNC - PACKET)
• Set your D7 GPS UNIT selection (in APRS menu) to NMEA
• Set your GPS to NMEA output. What we want is 4800 baud output for the D7 to receive. Some GPS let you select NMEA/NMEA (NMEA input and output). This allows the D7 to send waypoints (stations with positions heard) to the GPS for display on the map (if so equiped). If this clutters up your GPS you may want to turn off the NMEA input for the GPS (Output NMEA only). Please check your GPS users manual for details.
• Now that we have the settings correct, we need to make sure the hardware is correct. Read your serial number from the back of your radio S/N 0XXxxxx. If your serial number starts with a 011xxxxxx, or above - then your radio has the new firmware inside. You should have few compatibility issues with GPS units. If your serial number starts with a 010 and below -AND you have not sent your radio in for not sent your radio in for a firmware upgrade, then you may have some compatibility issues(check compatibility chart if this is you).
• The next step is making a cable to connect the D7 to your GPS. Open your manual to page 53 (we were refered here from page 61 under Note:) . Notice that on the plug itself, they talk about the TXD and RXD. This seems to be in reference to the GPS and not the TH-D7. Many of us (including me) have connected the wiring wrong the first time, only to reverse it to make it work correctly. I think this could have been described in the manual a little better by showing the actual connections for the PC as well as a seperate illustration for the GPS.Want to buy a pre-made GPS cable? Check this out: http://www.blue-hills-innovations.com/blmstr.htm
• Ok, we are ready to start. Connect the cable and turn on both units. Push the POS button on the D7. There should be a 00.00.00 with flashing decimal places. In a few seconds this should turn to a real lon/lat.

Click here if you would like to see the page from Kenwood's manual about PC connectors.

Most problems can be solved by going through all the above. If this does not solve your problem, go through it a second time. time.