if your calling sum1 for fun we say
exp
bigpete, big pete, big pete, this the the celtic knot ya out there?
if calling for tow boat same thing but a little more. sadly we have had to use this once
tow boat, tow boat, tow boat, this is a 21' power boat ( than state your problem) they will ask you the rest
heres a channel guide
http://wireless.fcc.gov/marine/vhfchanl.html