In general, it is legal to record in public with an action camera, but there are some limitations to be aware of. Most countries have laws regarding privacy and data protection, which means that you should not record people without their consent in areas where they have a reasonable expectation of privacy, such as in bathrooms or changing rooms. Additionally, some public places such as government buildings or military installations may have restrictions on photography or videography. It is always a good idea to be aware of your surroundings and any applicable laws or regulations before recording with an action camera in a public place.