PMC

Final Fitts’ law models of each individual interface plotted on the same graph for comparative purposes.
Note. MCP = mode control panel; CDU = control display unit; TND = touch-based navigation display.

Comparison of measured and simulated attack trajectories. Panels display measured attack trajectories (dark blue) and best-fitting simulations (light blue) for each Harris’ Hawk in pursuit of the lure (magenta), arranged by individual bird (rows) and by guidance law (columns; PN: proportional navigation; PP: proportional pursuit; PN + PP: mixed guidance law). The time delay τ (s) and guidance constant K (s⁻¹) or N are independently fitted to each flight for PP and PN, but are globally fitted to all flights for the mixed guidance law. For each bird, we display the flight with the least prediction error ε (m) under the mixed guidance law (excluding flights <20 m), to best show the complementarity of its PN and PP elements: whilst all flights are well-modelled by the globally fitted mixed guidance law, some are not well-modelled by PN or PP, despite these being independently fitted to each flight; see Supplementary Figs. – for all other flights. Grid spacing: 10 m

Experiment procedure for mode control panel (MCP) experiment, showing an illustration of the navigation display and heading control knob.

Experimental apparatus for the touch-based navigation display (TND) experiment, showing an illustration of the touchscreen display and its location on the flight deck.