Do not over complicate this as installing the GPS on your boat is not a hard task. However, it will vary depending on the type that you have. What it boils down to is if you have an internal or external antenna. With GPS devices that have an internal antenna, all you need to ensure is that it has a direct line to the satellites in the sky. These kinds are typically intended for smaller boats with hood access. If you have an external GPS antenna it works fairly similar, but there are a few differences.
Firstly, ensure that the antenna is installed on the top of the device in a way that has direct access to satellites (remember, the satellites are above you). From there, you need to connect the antenna to your GPS receiver and wire it back to the console. After this, you can begin to turn it on and enjoy GPS technology on the water.