Sheeeze you yankee clowns...

Block navigation in the Gulf is long practiced by coonasses who can not
read or write.

Block Charts document the location of oil and gas drilling locations in
the Gulf of Mexico. Each oil platform has a block number on a hailing
board on the side of the platform. You go up to the platform, read the
number and look at a block chart of the gulf. You know exactly where
you are. On most courses out into the gulf you can pass close enough to
an oil platform to read the block number. The Govt leases blocks to oil
companies for the right to drill.

Joe