# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

**Re: Scale a small area plotting sheet?**

**From:**Greg Rudzinski

**Date:**2016 Feb 28, 06:08 -0800

Steve,

Try 5 latitude scale graduations per minute of arc. Divide each graduation in half to get tenths of a MOA. Same goes for longitude scale (5' to 1'). This should cover enough area for plots using the DR position as the assumed position. If Pub 249,229, or 208 are used then you are stuck with the standard plotting sheet scaled as is to accommodate the needed assumed position plot for whole degree LHA and Latitude table entry.

Greg Rudzinski

From:Steve E. BryantDate:2016 Feb 27, 19:24 -0800Dear Navlisters,

I am plotting a two body fix using a USPS “Constant Latitude Scale Small Area Plotting Sheet,” form CLS 98. Each intercept is 0.3nm and 0.7nm respectively.

Is it permissible to expand the latitude scale such that each of the small divisions of latitude are representative of one tenth of a nautical mile as opposed to the more typical scaling where the smallest divisions of latitude are representative of one minute (one nautical mile)? Would it also then be necessary to expand the longitude scale the same way?

Otherwise, when plotting a fix using the typical latitude/longitude scale, the plot becomes extremely small or tight.

My preference is to "open up" the plot in an imagined attempt to improve the accuracy of the plot; if not, then simply to make the whole exercise easier.

Steve