The Minox Bn 7x50 Dc Nautic Porro Prism Binocular (Black) is a fully integrated digital compass in the centre of the field of view. BN 7x50 DC is equipped with an altimeter and a thermometer. A further highlight of the BN 7x50 DC includes a digital barometer function. Weather changes can thus be detected and predetermined in good time and for your own safety. The Minox Nautic Line binoculars are filled with nitrogen gas making them water tight and anti-fogging.