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1.4.1 ERCs-L, ERCs-H and TACs are presented at various scales and
depict airspace, air routes and radio navigation facilities.
1.4.2 ERCs-L are intended for use primarily up to and including FL200.
1.4.3 ERCs-L show an outline of the areas covered by TACs and VTCs.
These areas impact on the ERC-L presentation as follows:
a. Within the areas covered by TACs, full details of air routes may
not be shown due to lack of space.
b. Air route information within these areas will usually only include
the route line and bearing. Where space permits, the route
designator, distance and LSALT may also be shown.
c. Within the areas covered by TACs and VTCs, full details of
airspace may not be shown. Information may only indicate
lateral boundaries. Restricted and Danger area numbers and
sport aviation symbols may not be shown.
For complete details of aeronautical data in these areas refer to
the appropriate TACs or VTCs.
1.4.4 ERCs-H are intended to be used for operations above FL200.
1.4.5 TACs show details applicable to both high and low level operations
in terminal areas.
1.4.6 Aerodrome charts, Apron charts, Noise Abatement Procedures,
SID charts, STAR charts, DME and GPS Arrival charts, and IAL
charts are published in DAP EAST and DAP WEST.
1.4.7 Obstruction charts (Type A), when required to be produced, are
available from respective aerodrome owners/operators.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
2. AIR ROUTE DETAILS, SPECIFICATIONS AND CHART
DEPICTIONS
2.1 Air Routes
2.1.1 Air routes consist of ATS conventional and RNAV (Area
Navigation) routes.
2.1.2 The following designators are used to identify ATS conventional
and RNAV routes:
a. Conventional Routes:
Regional routes A, B, G and R.
Domestic routes H (one way) & J (two way).
Domestic routes V (one way) & W (two way)
– predominantly low-level.
b. RNAV Routes:
Regional routes (Tasman) L, M & N.
Domestic routes Q (180 – 359), Y (360 – 179),
T (two way) & Z (low level).
2.1.3 A black arrowhead on a route designator box indicates that the
route is to be used, within controlled airspace, only in the direction
shown by the arrow.
2.1.4 Air routes are divided into route segments. Each route segment
contains data for the magnetic track, distance, lowest safe altitude
(LSALT) and reporting requirements.
2.2 Lowest Safe Altitude
2.2.1 The LSALT specified for a route segment is that for IFR
procedures. Where an NDB or VOR mark the segment, the
tolerances applicable to the NDB are used. Unreported obstacles
up to 360FT may exist in navigation tolerance areas. Therefore,
LSALT is calculated by adding:
a. 1,000FT to the highest obstacle, where the highest obstacle is
more than 360FT above the height determined for terrain, or
b. 1,360FT to the height determined for terrain, where the highest
charted obstacle is less than 360FT above the height
determined for terrain.
The minimum LSALT published is 1,500FT due to lack of data
concerning terrain near sea level.
2.2.2 LSALT details for RNAV routes are shown in each grid square
formed by the parallels and meridians. On the ERCs-H, the grid is
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
at 4° intervals, and at 1° intervals on the ERCs-L and TACs. (See
also GEN 3.3 para 3.2).
2.2.3 On IFR charts, some LSALTs on one-way air routes have an
associated direction arrow. This arrow indicates that the LSALT is
only applicable in the direction of the one-way route, and a LSALT
has not been calculated for the opposite direction.
2.2.4 A LSALT without a direction arrow on any air route indicates that
the LSALT is the same in both directions. However, one-way
routes should only be flown, in controlled airspace, in the direction
indicated by the route designator box.
2.2.5 On ERCs, the LSALT figure is always attached adjacent to the
distance “bubble” of the route to which the LSALT applies. In areas
of chart clutter, these LSALT figures may sometimes cross
adjacent route tracks.
2.3 Track Bearing Specifications
2.3.1 Each route segment is shown as the minor arc of a Great Circle
passing through the end points. The track angles of the Great
Circle segments are measured at the end points. Rhumb Line
track angles can be determined by taking the track out and the
track in to the next way-point, and then averaging the Great Circle
track angles.
2.4 Reporting Points
2.4.1 Reporting points are normally referenced to a radio-navigation
aid, aerodrome, town or within 10NM of a town or a geographical
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