Aeronautical Information Manual (AIM), page 335
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12/10/15 AIM outbound ends of the holding pattern. When flying overlay and early stand alone procedures may have published GPS overlay or stand alone procedures timing specified. (See FIG 5-3-5, FIG 5-3-6 and with distance specified, the holding fix will be a FIG 5-3-7.) See paragraph 1-1-17, Global Position- waypoint in the database and the end of the outbound ing System (GPS), for requirements and restriction leg will be determined by the ATD. Some GPS on using GPS for IFR operations. FIG 5-3-5 Inbound Toward NAVAID NOTE- When the inbound course is toward the NAVAID, the fix distance is 10 NM, and the leg length is 5 NM, then the end of the outbound leg will be reached when the DME/ATD reads 15 NM. FIG 5-3-6 Inbound Leg Away from NAVAID NOTE- When the inbound course is away from the NAVAID and the fix distance is 28 NM, and the leg length is 8 NM, then the end of the outbound leg will be reached when the DME/ATD reads 20 NM. FIG 5-3-7 GPS/RNAV Holding NOTE- The inbound course is always toward the waypoint and the ATD is zero at the waypoint. The end of the outbound leg of the holding pattern is reached when the ATD reads the specified distance. En Route Procedures 5-3-13
Page 335 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures