Figure 3-5 Jacksonville Center

CHAPTER THREE

SNFO/SWSO VOICE COMMUNICATIONS

The situation may arise when you need to communicate directly with Center without any

previous radio contact with a Center controller (i.e., you were previously VFR and now desire

IFR clearance). An alphabetical listing of sectors and their associated frequencies is located in

the aerodrome/facility directory section of the IFR Supplement. By approximating your position

relative to one of the remote sites, you can find the appropriate discrete sector frequency

(Figure 3-5).

Figure 3-5 Jacksonville Center

There is an even easier method to determine which sector frequency you should try when you are

not under positive control. Figure 3-6 is part of a Low Enroute Chart. Small boxes located

throughout the chart show the name of the Center, the sector, and both UHF and VHF

frequencies. Fixing your position on the chart and picking the nearest box takes all of the

guesswork out of finding the proper sector. For example, if flying VFR west of the NATCHEZ

TACAN and the weather deteriorates to where an IFR clearance becomes necessary, you may try

contacting Houston Center on 381.5.

3-10 IFR COMMUNICATIONS