Abstract: Some embodiments of the invention provide a method for defining code-based policies. The method generates a policy-builder first view of a policy for display in a graphical user interface (GUI) by processing a syntax tree that is generated from a code second view of the policy. The method receives, through the policy-builder first view, a modification to a portion of the policy. To reflect the modification, the method updates a portion of the syntax tree that corresponds to the portion of the policy that is affected by the modification. Based on the updating of the syntax tree, the method updates the code second view by modifying a portion of the code second view that corresponds to the updated portion of the syntax tree.

Abstract: A control circuit detects a present navigation concern within a physical boundary such as a building and augments the presentation of a piloted vehicle's pilot's field of view to include cautionary imagery regarding the present navigation concern. Examples of navigation concerns include but are not limited to a risk of colliding with another piloted vehicle, human activity in the physical boundary, and a blocked-passageway state of concern. Examples of cautionary imagery include but are not limited to an image of a STOP sign, an image of a traffic light, and an image of a barrier.