When designing human-system collaboration to assist in strenuous manual tasks we need to develop methods of communication between the system and the human. In this paper we are evaluating augmented reality (AR) technologies for displaying task-relevant information when the target is on a work surface for a typically standing work operation. In this case we are testing AR interfaces for displaying sub-surface positions. To do this we compare four types of AR interfaces, a head-mounted see-through display, a mounted see-through display, top-down surface projection and graphical overlays on a static monitor. We performed the experiment with 48 participants. Data analyses show significant difference between the AR interfaces in terms of task completion times and user satisfaction with the projection-based display being the fastest and most satisfying to the participants.