When You use Bluetooth compatible GPS receiver,
there is no need for connectors.
If you plan to use the system outdoors, make sure that the computer
platform is rugged enough (for example low temperatures).
One problem with laptops is the available battery power. You will mostly
need some method to get power out of the vehicle's batteries to increase
the operating time of the laptop using some kind of power supply adapters.
Most laptops can be used outdoors, but there are also problems such as
overheating, unreadable screens in the sun shine or the ability to handle
If the system is your lifeline, use the best hardware available. And if
possible duplicate it all using different manufacturers for the components.
Make sure that there will not be any loose connectors due to vibrations.