Making an emergency report

When making an alarm report to the Coast Guard Center (emergency number 0900-0111 or VHF channel 16), various data are important.

Who
(ship) name, person?
What
is going on / type of ship / color / dimensions?
Where
your (geographical) position / sailing route / sailing plan / times?
Which
help do you need?
When
was the last contact or position known?