Cellular phones generally cannot provide ship to ship
safety communications or communications with rescue
vessels. If you make a distress call on a cellular phone,
only the one party you call will be able to hear you.

Most cellular phones are designed for a land-based service.
Their coverage offshore is limited, and may change without
notice.

Locating a cellular caller is hard to do. If you don't know
precisely where you are, the Coast Guard will have difficulty
finding your location on the water.

In some areas the US Coast Guard has established a
three character code to dial to be immediately connected
to the local Coast Guard Operations Center.

What is that three character code? [1 pt]