I have 3 Furuno's RDP139 and have been trying on and off for years trying to download the waypoints unsuccessfully. I followed the manual procedure's , 2.3 How to connect to PC and 6,2 uploading & downloading data. I am afraid of losing the data as the machines are obsolete. Later on I will hopefully would like to download it to a Furuno GP1971-F unit. When I try to download the data , the Furuno says data is sent but I can not find it on the pc. My guess is that the PC is not receiving the data. Is there special software needed to download the waypoints? Is there PC computer settings that need to be implemented? You advise is deeply appreciated. Thank you.