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VFR Guide - Royal Institute of Navigation

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Select turning points and fixes, plan radio calls<br />

c. Select a suitable altitude to fly. Decide what minimum altitude you are prepared to<br />

fly at (a safe margin above the highest obstacle near the route), and what minimum<br />

cloudbase you can accept, dividing the route into sectors if you wish. Controlled airspace<br />

may determine a maximum altitude also. Identify areas <strong>of</strong> possible bad weather, and safe<br />

routes to suitable diversion aerodromes if the weather or aircraft unserviceability makes<br />

that advisable. Check these aerodromes are available. Study your selected turning<br />

points and fix points to ensure you can identify them early from your direction <strong>of</strong> travel and<br />

can use them to avoid hazards. Remind yourself <strong>of</strong> the in-flight procedures you will use –<br />

refer to the RIN guide on “Visual <strong>Navigation</strong> Techniques”.<br />

d. Identify information (such as aerodrome and instrument traffic) you should get by<br />

radio, and plan when to ask for it. Practise making the relevant transmissions.<br />

e. Obtain a preliminary weather forecast (perhaps from TV or internet). Make an initial<br />

estimate <strong>of</strong> the time needed for the route in the probable wind conditions. Add a safety<br />

margin <strong>of</strong> at least half an hour (or 20% if greater) at this stage. Calculate the fuel required<br />

for that time. Check the times <strong>of</strong> darkness.<br />

f. Fill in the navigation log/flight planning form with all the information available.<br />

Tracks, distances, safe altitudes, variation, TAS (probably) and fuel consumption rates<br />

can be written down. Identify areas <strong>of</strong> probably high traffic density, such as „funnels‟<br />

through controlled airspace or terrain, or instrument approaches. List the radio<br />

frequencies <strong>of</strong> radar units, aerodromes, controlled airspace, and danger area services<br />

which you may need along the route or in case <strong>of</strong> diversion (check with NOTAMs and the<br />

NATS web site for amendments). List navigation aid frequencies, identification (you may<br />

wish to write down the morse dots and dashes), and protected ranges from the AIP and<br />

NOTAMs. Note any „listening squawks‟ near controlled airspace.<br />

www.rin.org.uk 2 Mar 2012

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