A method for localizing a more highly automated vehicle (HAF), in particular a highly automated vehicle, in a digital map. The method includes: ascertaining a global pose estimation for the HAF using a localization module of a vehicle system of the HAF, the global pose estimation comprising a position and orientation of the HAF; transmitting at least one landmark position and at least one associated landmark property to the vehicle system; ascertaining a relative position of the landmark position concerning the HAF at least partially on the basis of the pose estimation and the landmark position; performing at least one sensor measurement and checking that the at least one landmark property is detectable at the relative position; and outputting an error indicator as the result of the checking. A corresponding system and a computer program are also described.