You need a cable to connect the GPS to the Laptop (like this one: Computer USB Cable for Garmin Montana 600 650 650t)
Than You need software that will be able to talk to the GPS. If I`m on main roads I`m using vector maps software (like tomtom or garmin). If I`m off the beaten tracks I use Ozie Explorer.
You would also need a way to charge the laptop while in the car.
One thing to take into account are conditions of the overland travel. Modern mainstream laptops often don`t survive more than 5 years at home. So imagine what will happen on a rutted track. One solution is a rugged laptop. I`m using a Panasonic Toughbook and I`m quite confident it will not fail me. Other is a normal-ish laptop with ssd drive instead of normal HD.
This is just a quick note, ask away if You need any more info.
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