Abstract: A container apparatus for an object to be dropped, which contains an object to be dropped functioning as a point marker or a hydrographic conditions measuring device or the like and is dropped by a transport airplane such as an aircraft flying in the air to a water surface of sea, lake or the like, or to land or the like. The container apparatus follows a substantially uniform trajectory after being dropped by the transport airplane, and after being dropped, reduces the flight speed thereof to a fixed speed, to release the object to be dropped housed therein.

Abstract: A container apparatus for an object to be dropped, which contains an object to be dropped functioning as a point marker or a hydrographic conditions measuring device or the like and is dropped by a transport airplane such as an aircraft flying in the air to a water surface of sea, lake or the like, or to land or the like. The container apparatus follows a substantially uniform trajectory after being dropped by the transport airplane, and after being dropped, reduces the flight speed thereof to a fixed speed, to release the object to be dropped housed therein.

Abstract: An airdrop type buoy apparatus, which is dropped by a flight vehicle, such as aircraft, that is flying in the air, to a water surface of sea or lake to be floated as a marker, a hydrographic conditions measuring device or the like, for flexibly coping with a shock at the time of landing on the water to absorb the landing shock on a balloon and also suppressing the rise of an inner pressure of the balloon so that the balloon is hardly to burst.

Abstract: An airdrop type buoy apparatus, which is dropped by a flight vehicle, such as aircraft, that is flying in the air, to a water surface of sea or lake to be floated as a marker, a hydrographic conditions measuring device or the like, for flexibly coping with a shock at the time of landing on the water to absorb the landing shock on a balloon and also suppressing the rise of an inner pressure of the balloon so that the balloon is hardly to burst.

Abstract: There is provided a radar reflector apparatus that is mounted in a lifeboat or a small rescue boat or in a floating buoy used for salvage or search practice, or is used by itself independently, to serve as a radar wave reflector of a search radar. The radar reflector apparatus has a simple structure, and is folded when not in use, and when used, is unfolded automatically when dropped by a marine vessel or aircraft or the like.