Question

Ships often carried small cannons that were used when approaching shore in dense fog to estimate the distance to the hidden land. Why

Answer 1

Have you ever clapped your hands or shouted in the right place, and heard the echo from a building? The farther away it is, the longer it takes to hear that echo.

Have you ever counted off between the lightning and the thunder to judge how close it was?

Bats use the same kind of technology.

Answer 2

*boats