Aeronautics/Astronautics 

Sectional Aeronautical Charts - G3701.P6

... are designed for visual navigation of low to medium-slow aircraft. They are multicolored and, because of their scale, provide the most accurate means of navigating the aircraft by means of ground reference. These charts include such visual checkpoints as populated places, roads, railroads and other distinctive landmarks. They are named for a major city within their area of coverage, and are revised semi-annually.

Scale:
1 inch = 6.86nm
1:500,000

Terminal Area Charts (TAC) - G3701.P61

...show airspace designated as Class B airspace. Information on these charts show much more detail than Sectional Charts. They are updated every six months and are organized by airport.

Scale:
1 inch = 3.43nm
1:250,000

World Aeronautical Charts (WAC) - G3201.P6

...are designed for visual navigation by moderate speed aircraft operating a higher altitudes, up to 17,500 feet MSL (mean sea level).. WACs show the least level of detail of the three series. They do include information on roads, railroads, restricted areas, airports, and visual and radio aids to navigation. These Charts are organized by a letter-number group; e.g., CC-8 is the area of Alaska. Most are updated yearly; a few are updated every two years.

Scale:
1 inch = 13.7nm
1:1,000,000