If you have multiple sensors reporting the same data type, such as heading or location, you can select which sensor to use inside Orca. To do so:
Connect to your Core
Open Main Menu > My Boat > Connected Devices
Tap on the name of the device that you want to use
When a device is selected, the relevant instruments will use that single device as its source.
Some sources, such as tanks and batteries are always selected.
In this case, you can create instruments that rely upon each individual sensor.