Marine fuel management is like a game of cooking. Imagine you are going to make a cake, but instead of using ingredients that can be found in a kitchen, you are going to use a special kind of juice that makes a big boat move. Just like how you need to measure out the right amount of flour, sugar, and eggs to make a good cake, you also need to carefully measure out the juice, which is called fuel, to make sure the boat can go where it needs to go.
However, unlike making a cake, using too much or too little fuel can be very dangerous for the boat and anyone on it. That's why the people in charge of managing the fuel have to do it very carefully. They need to make sure they have enough fuel to get to their destination and back, but not so much that they are wasting it or putting extra weight on the boat.
To do this, they use something called a fuel management system, which is like a special scale that can measure how much fuel is used at different times. This way, they can make sure they are not using too much fuel, and they can plan ahead for how much fuel they need for future trips.
In summary, marine fuel management is like making a cake, but instead of measuring out flour and sugar, they are measuring out a special kind of juice called fuel, so that the boat can move safely and efficiently.