1. If necessary, install a wireless network adapter.
Open Connect to a Network by clicking the Start button , and then clicking Connect to.
Click Set up a connection or network.
Click Set up an ad hoc (computer-to-computer) network, click Next, and then follow the steps in the wizard. Be sure and check
An ad hoc network is automatically deleted after all users disconnect from the network or when the person who set up the network disconnects and goes out of range of the other users of the network, unless you choose to make it a permanent network when you create it (recommended).
If you share your Internet connection, Internet connection sharing (ICS) will be disabled if you disconnect from the ad hoc network, you create a new ad hoc network without disconnecting from the old ad hoc network for which you enabled ICS, or you log off and then log back on (without disconnecting from the ad hoc network).
On subsequent computers, just connect to the network you created. Onboard a boat, not connected to the Internet, password protection might not be needed. Your call.