As a researcher aboard the Challenger, which of the following newly invented pieces of equipment would you need to be trained on how to use?

the sextant
the compass
the remote control submarine
or
the Buchanan water sampler

Question

As a researcher aboard the Challenger, which of the following newly invented pieces of equipment would you need to be trained on how to use? 

 the sextant
the compass
the remote control submarine
or 
 the Buchanan water sampler

anonymous · Answer

I believe it would be the Compass

anonymous · Answer

It is tool known for navigational purposes so it would make sense that this would be the answer.