Sample: Enter with MEA of 13,000 feet. Read allowable gap 18.5 NM.  60  55  50  45  40  35  30  25  20  15  10  5  0  5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 Allowable navigation course guidance gap (NM)  NOT FOR NAVIGATION MEA of airway or route segment  (thousands of feet) VOR 116.4  147° 4.1 NM  DME and VOR check radial  VOR test facilities (VOT)  Facility Name .............................. Type VOT  (Airport Name) ...........Frequency  Facility Remarks  Bradlay Intl .................... 111.40 G  Bridgeport ..................... 109.25 G  Groton ........................... 110.25 G  Hartford ......................... 108.20 G  Figure 2-50. VOR test facilities (VOT) frequencies.  Figure 2-51. VOR checkpoint signs.  Figure 2-49. Navigational course guidance gaps.  2. On the VOR, set the course selector to 0° and the  track bar (TB) indicator should read center. The TO­ FROM indicator should read FROM.  3. Set the course selector to 180° and the TO-FROM  indicator should read TO and the TB should then be  centered.  2-30  Many aerodromes have VOR checkpoint signs that are  located beside the taxiways. [Figure 2-51] These signs  indicate the exact point on the aerodrome that there is  sufficient signal strength from a VOR to check the aircraft’s  Note: Determining the exact error in the receiver is done  by turning the track selector until the TB is centered and  noting the degrees difference between 180° or 0°. The  maximum bearing error with the VOT system check is plus  or minus 4° and apparent errors greater than 4° indicate  that the VOR receiver is beyond acceptable tolerance.  VOR Checkpoint Signs 