Which device is NOT typically RNAV capable?

The device that is typically not RNAV capable is the altimeter. RNAV, or Area Navigation, involves using various navigational aids to determine an aircraft's position and intended flight path, allowing it to navigate without relying solely on ground-based navigational aids.

An altimeter primarily measures altitude by assessing atmospheric pressure and does not contribute to lateral navigation. In contrast, devices such as GPS, DME (Distance Measuring Equipment), and VOR (VHF Omni-directional Range) can provide positional information and navigational data relevant to RNAV systems. GPS provides precise positioning through satellite signals, DME offers distance information from a specific navigation aid, and VOR stations help determine an aircraft's position relative to specific ground stations. Therefore, while the other options contribute directly to RNAV capabilities, the altimeter serves a different function, focusing solely on altitude measurement.