Simrad GO XSE Series Operator's Manual page 204

Iperf
Iperf is a commonly used network performance tool. It is provided
for testing wireless network performance around the vessel so weak
spots or problem areas can be identified. The application must be
installed on and run from a tablet device.
The unit must be running Iperf server before initiating the test from
the tablet. On exiting the page, Iperf automatically stops running.
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