You can do most functions with just the Iridium GO!, however the DataHub has some great features to add to the Iridium GO!

When cruising coastal, the DataHub will continue to track and store your positions if you don't have the Iridium GO! airtime active. The DataHub can connect via a USB tether or Wi-Fi hotspot to keep your tracking live in real-time or store your positions and upload them when you next connect via Cellular or high-speed Wi-Fi such as at the marina.

You can connect the DataHub to your N2K network. This allows your tracking position reports to include the TWS and TWD from your boat sent to your tracking page display.

The DataHub can broadcast N2K data over DataHub Wi-Fi and via the Ethernet LAN port, so if your chart plotter stops working, you can use a laptop or tablet as a backup navigation device.

If you have AIS connected to your N2K, that data will be displayed also.

The DataHub samples your boat's NMEA 2000 instrumentation data in real-time while the boat is sailing. Then, the data is transferred to PredictWind servers for automated analysis to create your custom AI boat polar.
Accurate boat polars, which are performance metrics specific to your boat, are critical for meaningful results in the PredictWind Weather Routing and Departure Planning features. Please note a Professional forecast subscription is required for AI Polar generation.