The Foretrex 601 and 701 navigation devices are extremely durable. They meet military standards for heat, shock, and water resistance. Additionally, they feature tactical functions such as compatibility with night vision devices and the Jumpmaster mode. Both the Foretrex 601 and Foretrex 701 operate with three satellite navigation reception networks, including GPS, GLONASS, and Galileo, to determine your position even in more challenging environments than GPS alone. The battery life exceeds 48 hours in navigation mode and up to 1 week in UltraTrac mode.