In voice communications, the basic letter of a designator  should be spoken in accordance with the International Civil  Aviation Organization (ICAO) spelling alphabet. Where the  prefixes K, U, or S, previously mentioned, are used in voice  communications, they should be pronounced as:  Where suffixes F, G, Y or Z specified in above, are used, the  flight crew should not be required to use them in voice  communications. Below is an example of how the letters  and numbers are spoken.  2-24  Figure 2-45. Published RNAV jet routes.  Note: RNAV Q-routes require en route RNAV 2, corresponding  NAV/E2 code and PBN/C1-C4 based on navigation system  update source.  a.  F—to indicate that on the route or portion thereof  advisory service only is provided;  b.  G—to indicate that on the route or portion thereof  flight information services only is provided;  c.  Y—for RNP 1 routes at and above FL 200 to  indicate that all turns on the route between 30°  and 90° must be made within the tolerance of a  tangential arc between the straight leg segments  defined with a radius of 22.5 NM;  d.  Z—for RNP 1 routes at and below FL 190 to  indicate that all turns on the route between 30°  and 90° should be made within the tolerance  of a tangential arc between the straight leg  segments defined with a radius of 15 NM.  Use of Designators in Communications  K—Kopter  U—Upper, as in the English language  S—Supersonic  A11—Alpha Eleven  UR5—Upper Romeo Five  KB34—Kopter Bravo Thirty Four  UW456—Upper Whiskey Four Fifty Six  NOT FOR NAVIGATION N60°53.97´ W 151°2163´  114.3 ANC 221.3°-37.0  AMOTT  280  MEA-28000  J888R  J996R  J804R 61.2  61°  246 237 226°  AMOT T  37  22 $^{10}$346 