What does "ingate" mean at the port?

Could you please clarify the term "ingate" as it's used in the context of a port? Is it referring to a specific process, area, or equipment used in the port's operations? Is it a technical term specific to the shipping industry or a more general one that can apply to various types of ports? Understanding the precise meaning of "ingate" would help us better grasp its significance in the context you've mentioned.