Mercator Templates

Using the ChartComponents package, I generated some Mercator Templates (aka Mercator Plotting Sheets) that can be used for celestial navigation. They're available as pdf documents in different sizes: 11" x 8½", 11" x 17" and 17" x 22".
The Letter format (11" x 8.5"), which is quite small. I need to try it to make sure this is not too small. I reduced on all versions the latitude span to 3 degrees (instead of 6, on the charts published by the French SHOM, format ½ Grand Aigle), for the definition of a mile not to be too small.