Probably the most important step is choosing the right cellular modem. You'll most likely obtain your cell modem from your existing cell phone provider such as Verizon, T-Mobile, ATT, Sprint, etc. You will want to take a look at the models they offer and make certian they are compatible with the cellular amplifier and cellular router you get.

The type of external antenna jack on the modem is what makes it compatible with the amplifier. Most modems have an external antenna jack, but not all of them. Among the ones with jacks, there is quite a variety of jack types. So, it is important to choose a cell modem that has a jack that you will be able to easily find an adapter for. The adapter allows the modem to connect to the amplifier. Here is a list of adapters for the DA4000 amplifier Digital adapters. If your cell modem was listed there, then you are all set.

Next you will want to see if your cell modem is also supported by the router. Click on the support tab on this page to see Cradlepoint MBR1000. You should note that using a router is optional. Although, keep in mind that without the wireless router, you won't be able to move your laptop or computer around your boat easily as it will be connected with a wire. Also, a wireless router makes it easy for multiple computers to have simultaneous connections to the internet.

Your modem will connect directly to your amplifier using the adapter that you found for your modem earlier here. Digital cell adapters
Now your modem an either plug directly into your computer or cradlepoint router.
Power it all up and you're online!