A more thorough explanation:

Definition: A locator is a person who either lets out property or services for a fee or contracts another person to perform work for a fee. In Roman law, a locator can be a lessor, landlord, day laborer, or someone who employs contract labor. Additionally, a locator can be someone who is entitled to locate land or set the boundaries of a mining claim.

• A landlord who rents out an apartment is a locator.
• A person who hires a contractor to build a house is a locator of contract labor.
• A day laborer who offers their services for hire is a locator operarum.
• A person who sets the boundaries of a mining claim is a locator.

These examples illustrate how a locator can be someone who either provides a service or property for a fee or contracts someone else to do so. In the case of a landlord, they are letting out property for a fee. In the case of a person who hires a contractor, they are contracting someone else to perform work for a fee. A day laborer is offering their labor for hire, and someone who sets the boundaries of a mining claim is entitled to do so as a locator.