Navigation

S 21 5 1 2 4 2 1 3 0 6 3 3 3 Figure 16-31. Radio magnetic indicator. 16-25 W 7 30 33 N 3 6 30 33 3 6 W HDG 33 3 O 42 BS 12 S F 5 R 1 OM21 E 42 I2 5I 2I 30 6 42 I2 5I 2I 8 A D F E A D F W 30 33 N 3 E 6 6 33 3 6 I2 O 42 BS 12 S F 5 R 1 OM21 03 42 I2 5I N 0 N 3 6 E NAV NAV 30 33 3 6 18 03 33 W FROM 51 12 42 I2 5I 2I OBS 42 12 S 33 N 3 30 TO 6 W 5 E O 42 BS 12 S 51 21 W 30 33 N TO 3 6 30 33 3 6 O 42 BS 12 S 51 21 E 42 I2 5I 2I 4 W 30 33 N TO 3 6 30 33 3 6 O 42 BS 12 S 51 21 E 42 I2 5I 2I 3 3 33 6 30 2I 42I2 5I 33 N 3 2 30 TO 6 W E O 42 BS 12 S 51 21 W 30 33 N TO 3 6 30 33 3 6 1 O 42 BS 12 S 51 21 E 42 I2 5I 2I Figure 16-32. Tracking a radial in a crosswind. 72 6 finder (ADF) bearing information. [Figure 16-31] Remote indicating compasses were developed to compensate for errors in and limitations of older types of heading indicators. The remote compass transmitter is a separate unit usually WIND mounted in a wingtip to eliminate the possibility of magnetic interference. The RMI consists of a compass card, a heading index, two bearing pointers, and pointer function switches. The two pointers are driven by any two combinations of a GPS, an ADF, and/or a VOR. The pilot has the ability to select the navigation aid to be indicated. The pointer indicates the course to the selected NAVAID or waypoint. In Figure 16-31, the green pointer is indicating the station tuned on the ADF. The yellow pointer is indicating the course to a VOR or GPS waypoint. Note that there is no requirement for a pilot to select a course with the RMI. Only the selected navigation source is pointed to by the needle(s). BRAVO BRA 115.0 Tracking With VOR The following describes a step-by-step procedure for tracking to and from a VOR station using a CDI. Figure 16-32 illustrates the procedure. First, tune the VOR receiver to the frequency of the selected VOR station. For example, 115.0 to receive Bravo VOR. Next, check the identifiers to verify that the desired VOR is being received. As soon as the VOR is properly tuned, the course deviation needle deflects either left or right. Then, rotate the azimuth dial to the course selector until the course deviation needle centers and the TO-FROM indicator If a heading of 350° is maintained with a wind from the right indicates “TO.” If the needle centers with a “FROM” as shown, the aircraft drifts to the left of the intended track. indication, the azimuth should be rotated 180° because, in As the aircraft drifts off course, the VOR course deviation this case, it is desired to fly “TO” the station. Now, turn the needle gradually moves to the right of center or indicates the aircraft to the heading indicated on the VOR azimuth dial or direction of the desired radial or track. course selector, 350° in this example.