AIM

4/3/14

9−1−8

Types of Charts Available

2. The National Flight Database (NFD)

(ARINC 424 [Ver 13 & 15]).

The NFD is a basic

digital dataset, modeled to an international standard,

which can be used as a basis to support GPS

navigation. Initial data elements included are: Airport

and Helicopter Records, VHF and NDB Navigation

aids, en route waypoints and airways. Additional data

elements will be added in subsequent releases to

include: departure procedures, standard terminal

arrivals, and GPS/RNAV instrument approach

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. Sectional Raster Aeronautical Charts

(SRAC).

These digital VFR charts are geo−

referenced scanned images of FAA sectional 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 SRAC data to

support a variety of needs. Most SRACs are provided

in two halves, a north side and a south side. The file

resolution is 200 dots per inch and the data is 8−bit

color. The data is provided as a GeoTIFF and

distributed on DVD−R media. The root mean square

error of the transformation will not exceed two pixels.

SRACs DVDs are updated every 28 days and are

available by subscription only.