late to thread, but have you set the dual to be non-ios?.. the factory ships it to work by default with ios, not windows.
here is an old thread/post which may help with setup..
Dual XGPS150A with Windows & Opencpn
Originally Posted by NWSail
I purchased a Dual XGPS150A
unit for use with OpenCPN
running on Windows 10. I purchased this unit because it was listed on the OpenCPN hardware page
(second row from the bottom). However, I have been unable to get the unit to show a position in OpenCPN
. Windows 10 indicates that it is paired with the unit, the unit appears up under Bluetooth devices and also shows com ports
assigned for both input and output. But the XGPS150 unit's blue Bluetooth light flashes at 1 second intervals indicating that it does not think it is connected. Dual has not been very helpful so far in solving this problem. There is documentation
telling how to set this device up with earlier versions of Windows but not Windows 10. Those directions are not applicable to Win 10. I'm hoping that there is someone who has an understanding of Bluetooth to OpenCPN protocols might be able to troubleshoot this problem. I have attached a picture of screen
shots of Windows 10 settings.