by rain or snow. The commander and driver have periscopes allowing both of them a more detailed view of the surrounding terrain. The commander has six TNP-A periscopes (five in the front and one on the side of the vehicle), a TPKU-2B day sight and a TKN-1 night sight(night-vision device). The driver has four TNP-A periscopes (all in the front), one of which can be replaced by a TWN-2B night-vision device. The gunner is in the turret during combat, but when traveling he is seated inside the hull. The crew mounts and dismounts the vehicle via two hatches over driver's and commander's stations. On either side of the hull adjacent to the crew position, there is a firing port. Immediately behind the firing port there are three TNP-A periscopes, which protrude from the outside of the hull, giving the crew some vision to the front and rear of the vehicle. The engine is larger than the BRDM's (it is a 140 hp V-8 instead of a 90 hp 6-cylinder). The BRDM-2 has an IR spotlight and four IR driving lights, as well as an over pressure collective NBC filter system. The IR spotlight is located on top of the commander's periscope. The vehicle also has an R-123 radio and an antenna on the right side of the hull next to the commander's hatch, for communication. There's also a winch mounted internally at the front hull that has a 30 m cable and a 4 tonne capacity. The winch is intended to be used, among others, for self-recovery when stuck in difficult terrain. A spare tire can be mounted on top of the turret. This was most often practiced by Polish crews. Like its predecessor, the BRDM-2 is amphibious. The GAZ-41 gasoline V-8 engine supplies power to the circular water-jet, equipped with a four-bladed propeller at the rear of the vehicle, which is covered with an armoured shutter while on land. This shutter is opened at the same time as the trim board by hydraulics, which must be done before entering water. The water-jet allows amphibious travel with a speed of 10 km/h for 17 to 19 hours. A trim board, which is stowed under the nose of the hull when traveling, is erected at the front of the hull before entering the water to improve the vehicle's stability and displacement in the water and to prevent the water from flooding