If you installed HumminbirdPC first and then installed Google Earth through HumminbirdPC, typically it should automatically sync them. If not, we recommend to install both programs separately. Then go into HumminbirdPC to “view in Google Earth” click on Yes when prompted do you have Google Earth installed and then sync the programs by following the direct path to where the program was installed on the PC.
This is typically found at the following path and then select the googleearth.exe
C:\Program Files\Google\Google Earth Pro\client
If this does not sync the programs it would likely be a program on the computer such as pop up blocker, antivirus program or something other program that is blocking the sync.