replacing a gp36 with a gp39

jpeters

New member
good friend of mine has 3 gulf shrimp boats. He has a pc that is interfaced to his gps units. Two in each boat for redundancy. The gp36 units connect to the pc via rs232 serial ports and displays on a program called pc windplot. The gp39 does not send data to his pc. I think I read where the gp39 no longer supports rs232 interfaces. I think the 39 is rs422. Which converter would work with these or will these work with the usb port on the gp39?
 
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