||When you set the standard parallel, you are setting both standard
parallels. That is, if you set the standard parallel 1 to 40N,
implicitly, the other standard parallel is 40S. The display won't look
different, but if you check a point off the equator, you 'll see the
coordinate values change pretty dramatically. Here's an example.
The point is on an island off the southern tip of South America.
World_Mercator with 40N