Cosmos 188 incorporated a Soyuz programme descent module for landing scientific instruments and test objects. Automatic mating of Soyuz test spacecraft in orbit was accomplished on October 30, 1967, by Cosmos 186 and Cosmos 188. Mutual search, approach, mooring, and docking were automatically performed. After 3.5 hr of joint flight, the satellites parted on a command sent from the earth and continued to orbit separately. On November 2, 1967, Cosmos 188 made a soft landing in a predetermined region of the USSR.
Text comes from NASA NSSDC Master Catalog (http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1967-107A)
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Cosmos 212 was successfully recovered on April 19, 1968 at 08:10 GMT.
Cosmos 213 launched at 09:36 the next day, and Cosmos 212 immediately began the active rendezvous phase.
As a backup in case of failure of the ion sensor, it was planned that a cosmonaut on earth would use television of the Vzor optical orientation device to orient the spacecraft in the direction of movement.