12/2/21
AIM
procedures. The database is updated every 28 days.
The data is available by subscription only and is
distributed on CD
−
ROM or by ftp download.
3. digital
−
Visual Charts (d
−
VC).
These digi-
tal VFR charts are geo
−
referenced images of FAA
Sectional Aeronautical, TAC, and Helicopter Route
charts. Additional digital data may easily be overlaid
on the raster image using commonly available
Geographic Information System software. Data such
as weather, temporary flight restrictions, obstacles, or
other geospatial data can be combined with d
−
VC
data to support a variety of needs. The file resolution
is 300 dots per inch and the data is 8
−
bit color. The
data is provided as a GeoTIFF and distributed on
DVD
−
R media and on the AIS website. The root
mean square error of the transformation will not
exceed two pixels. Digital
−
VCs are updated every 56
days and are available by subscription only.
FIG 9
−
1
−
14
Chart Supplement U.S. Geographic Areas
Types of Charts Available
9
−
1
−
11