| 摘要 |
After resurfacing, divers are often a long distance from their starting position, so that they still have to swim back there in their tired state. In order to assist with this, the invention proposes an underwater navigation apparatus, consisting of an ultrasound transmitter, which is arranged in the water underneath the starting position, and a directional receiver which is carried by the diver and allows him to move in the direction of the starting position in the decompression phase, that is to say while resurfacing. <IMAGE>
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