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CHAPTER TWO
LOW-LEVEL CHART PREPARATION
200.
INTRODUCTION
The success of any low-level, high-speed navigation flight depends primarily on route choice and
preflight planning. After determining the basic routing, it is necessary to select the appropriate
chart(s), accurately plot the route (measure twice, then mark in pencil, double-checking before
you mark in ink), and determine headings, altitudes, and any other information necessary to
successfully complete the mission. In this section, the instructor assists students in preparing a
low-level chart for the first VNAV flight. All remaining VNAV charts are completed outside of
the classroom. Neatness counts: your charts are a reflection of you and your professionalism!
201.
DETERMINE THE ROUTE
The T-6A low-level training routes used by VT-4/10 are stereo routes defined by Letter of
Agreement. These stereo routes are described in detail in the T-6A VNAV Stereo Route
Handout. Each of the stereo route descriptions includes all of the low-level points (A, B, C, etc),
plus the routing and altitudes to and from the low-level routing. This information describes your
entire route of flight for your VNAV sorties, and a copy of each route's description will be
affixed to the back of the prepared chart. Later in the T-1/T-39 phase, this information will come
from AP-1B.
202.
SELECT APPROPRIATE CHART
Accurate navigation at low altitudes requires detailed charts. The typical charts used for low-
level visual navigation are 1:500000 scale or larger. The primary chart used at VT-4/10 is the
TPC, specifically the TPC H-24B. Most VT-4/10 training routes can be plotted on this chart.
Ensure you have the most current available edition of the chart. Refer to the Chart Update
Manual (CHUM) to verify the chart edition.
203.
PLOT TURNPOINTS
With the route identified, transfer the route coordinates to the 1:500,000 TPC chart. If this was
the very first construction and planning of the route, the coordinates would be plotted and the
nearest visually significant feature within NM would be chosen as the turnpoint. However, the
route descriptions already designate these features (see VNAV Stereo Route Handout). These
features (e.g., dam, power plant, tower, etc.) are the turnpoints you use in flight and for mission
planning purposes, such as distance and course computations.
Use a pencil and nickel-size template to place a circle around the significant visual feature at
each point except the target. No other marks except CHUM annotations are allowed in the
turnpoint circle! For now, label these points in pencil.
LOW-LEVEL CHART PREPARATION
2-1


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