Is it possible to connect the R400N to multiple AIS sources?
Yes, the R400N is able to receive AIS data from multiple sources via its network connection. To enable you to successfully monitor multiple AIS streams each one has to be set up on a different port, each will show as a separate AIS feed on your connected device.
Instructions on how to configure your R400N to achieve this can be found in the user manual, available to registered users here: Product Manuals
More advanced applications and in depth trouble shooting guides can be found here: Digi Device Discovery Utility