Zebra has the ability to use several different map projections for horizontal plots.
This capability is not useful in many situations, but can be crucial for some projects. This projection has the advantage of producing fast graphics. It works quite well in situations where a small area is being plotted, or where the plot area is in the tropics. Several other projections are available, if your version of Zebra has been built to include them. Binary distributions from RDP have projections enabled.