Please be more specific. How did it break? If there is something wrong with the magnetic needle inside, such as the north direction is unclear or the magnetic force is weakened, it should be easier to deal with. Take off the top cover, take out the magnetic needle placed on the pointer (if it is fixed, it needs a tool to take it out), then find a fixed magnet (preferably square) and gently rub the magnetic needle along the direction of the magnetic needle at the extreme edge (don't rub horizontally from left to right, but gently rub along the direction of the needle tip). This is actually a natural lesson when I was a child. Just reinstall it ~!
If the compass is cracked or painted, hehe, it can only be replaced with a new one ~!