Did you configure Coastal Explorer to use the AIS in the “Settings > Electronics” area?
The Vesper AIS (and pretty much every other device other than our Nemo Gateway) must be configured in Coastal Explorer to be used. Unfortunately very few device manufactures incorporate a means for their devices to be “discovered” on the network automatically, so you need to configure any software to use them.
More information can be found in the Configuring Electronics topic.