I have had a look at the manual and I can see that it only accepts GPS input and output at 4800 Baud. So you are limited by the VHF DSC. But your solution of attaching the VHF to the A031 and having the GPS information go through it should work nicely. We would always remind our customers to check Baud rate speeds if there is issue with their equipment. All of our multiplexing products offer a wide range of Baud rate speeds for the majority of equipment out there. I hope it will all go smoothly now. Please let us know if you have any further queries.
Best regards