The answer to this question is a bit complicated and depends on the type of chair you have. Some chairs have removable cushions, while others do not. Additionally, some chairs have removable armrests, while others do not. Ultimately, it depends on the model and make of your chair.
If you're unsure whether or not your captain's chair is removable, it's best to consult your owner's manual or contact the manufacturer directly. In most cases, they will be able to provide you with specific instructions on how to remove the various parts of your chair.