What method of underwater detection is short of "sound navigation and ranging"?

More Questions:

Who was pictured on the first US adhesive stamp?

Who was the Phillips screw design named after?

In a deck of Bicycle brand playing cards, what type of character is depicted riding a bicycle on the Joker card?

Who are the three Bronte sisters?

What duo published the story of "Hansel & Gretel" in 1812?

What Latin phrase actually comes from a poem, attributed to Virgil, about a salad recipe?

What is the two letter postal abbreviation for the state of Delaware?

What lake is the world's deepest lake?

The Place de l'Etoile is the traffic circle that surrounds what landmark?

Which planet spins on a nearly horizontal axis, as opposed to all the others which spin on a vertical axis?

Which gender has the XY chromosomes in human beings?

What human organs are affected by glaucoma?

During which time period did the stegosaurus walk the earth?

Who has been played in a movie by both Norma Shearer and Kirsten Dunst?

What name was given to the fishing dispute between Spain and Canada that lasted from 1994 to 1996?