Thermal Camo is a ground vehicle specialization featured in Battlefield 3, the counterpart to Stealth for air vehicles. When equipped, a vehicle's thermal signature is reduced when viewing through Thermal Optics. The vehicle also becomes harder to track using guided missiles/shells, and if spotted, the mark will disappear sooner. Vehicles using Thermal Camo have their "active spotted time" reduced by 66% and their "passive spotted time" reduced by 99%. Weapon lock takes 60% longer to achieve.