sailer of a light fast vessel
A sailor.
caravel
Caravel.
A barque, a caravel, brig, a carrack, a clipper, a corvette, a frigate. These are some of the types of sailing vessels that can have three masts
A brig
A sloop
schooner
Yes. The americans call it a cell due to the way the masts cover a small overlapping area (or cell).
They are basically a 'relay station' The handset transmits a signal to the nearest masts, and the masts re-transmit the signal to the next mast, and the next etc... until the call reaches its destination.
You call them kilometres
Portable (cell) phones are low-power devices - they have a limited range. Each mobile-phone communicates with at least three mobile 'masts' to establish its location so the network can keep the call connected. These masts cover a set area - or 'cell' (which is why americans call them cell-phones). The masts communicate with each other to connect the call to its destination.