Fig.1

Upper left panel shows an early prototype of the ARTS (2004) and upper right panel shows an ARTS model for deployments of satellite tags (ARTS-S, 2007). The ARTS model for deployments of larger sensor packages (ARTS-D, 2012) with an offset sighting bar is shown in lower left panel, while details of the main components on the ARTS housing, with the valve function, pressure control (small manometer), trigger and standard aiming device (Riflescope ZOS), is shown lower right panelPhoto by Tom Are Mathisen