Characteristics of a Lambert Conformal Projection
Parallels - equally spaced concentric circles
Meridians - straight lines converging at the poles
Scale - constant distance scale
Great circle - straight line
Figure 4.2-3 Lambert Conformal Projection
TYPES OF LAMBERT CONFORMAL CHARTS
The main types of Lambert Conformal charts available for navigation are the Operational
Navigation Chart (ONC) and the Tactical Pilotage Chart (TPC). A legend that explains
chart symbology is located in the left margin. It is important to mention that the meridians of
all Lambert conformal charts (such as the ONC and TPC) are oriented toward the
geographic true North Pole.
The ONC provides worldwide coverage at a scale of 1:1,000,000. It contains multicolor
hydrographic and cultural features and is used for planning long range navigation. You will
be exposed to the ONC chart at your follow-on squadrons.
The TPC provides worldwide coverage at a scale of 1:500,000. It provides increased
details of ground features significant for visual and low-level radar navigation. The TPC is
the most commonly used chart for route and checkpoint determination. A section of a TPC
chart covering NAS Pensacola is depicted in Figure 4.2-4.