AIS: USB dongle or via integrated VHF radio?

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If I had the choice, I'd get the VHF with integrated AIS receiver. Splitters can add a bit of loss, and certainly add a couple more connectors which can fail or add loss. Also, you are using the main VHF antenna, which for most folks is at the top of the mast. You'll gat better range and more reliable reception of closer targets.

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