E c vdop max s sv e c is calculated at the time of

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e c = VDOP max * s sv ; e c is calculated at the time of most recent calibration VDOP max = the maximum value of VDOP i for each satellite in use VDOP i = VDOP with i th satellite removed b el = 0.5 meters/nm when in level flight b en = 13 meters/1000 ft. altitude change above 18,000 ft. plus 23 meters/1000 ft. altitude change from 6000 to 18,000 ft. plus 32.5 meters/1000 ft. altitude change below 6000 ft. v = average ground speed in knots since the last GPS calibration of altitude t = flight time in hours since the last GPS calibration of altitude NOTE: Average ground speed must be determined as the integral of instantaneous ground speed over the time since the last GPS calibration divided by the time since last GPS calibration. The tests of paragraph (a)(3)(xx)(1)(b) will be unsatisfactory if ground speed is determined by dividing the difference in position by time. (xxii) Flight Plan Capability . Add the following requirement to RTCA/DO-208: The equipment shall provide the capability to create, display, and edit a flight plan consisting of a minimum of 9 waypoints. A means shall be provided to readily display each waypoint, individually or together, of the active flight plan (in sequence) for review. (4) Exceptions to RTCA/DO-208 for Class B( ) Equipment : (i) The following paragraphs of RTCA/DO-208 do not apply to GPS sensors certified to class B( ) requirements: 2.1.8, 2.1.10, 2.1.11, 2.2.1.1 through 2.2.1.10, 2.2.1.12, 2.3, 2.5.2.1 through 2.5.2.4, 2.5.2.10, and Page 28    (a)(3)(vii)  
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TSO-C129a 2.5.3. The following paragraphs of RTCA/DO-208 do not apply to GPS sensors certified to class B(3) and Class B(4) requirements: 2.5.2.5 and 2.5.2.7. The integrated navigation system with which the GPS sensor is installed shall provide the following. GPS sensors certified to Class B( ) must demonstrate that the GPS sensor, when incorporated into an integrated navigation system (flight management system, multi-sensor navigation system, etc.) meets all of the requirements of this TSO, including the requirements listed below. The GPS installation procedures shall specify for reference which integrated navigation system was used for this demonstration. 1. Maneuver anticipation capability equivalent to that required by paragraph (a)(3)(v) of this TSO for equipment certified to class B1/B3. 2. Numeric display information equivalent to that required by paragraph (a)(3)(vii) of this TSO for the appropriate equipment class (B1/B3 or B2/B4). 3. Non-numeric display information equivalent to that required by paragraph (a)(3)(viii) of this TSO for the appropriate equipment class (B1/B3 or B2/B4). 4. Waypoint distance display capability equivalent to that required by RTCA/DO-208 paragraph 2.2.1.2 for the appropriate equipment class (B1/B3 or B2/B4). 5. TO-FROM Indication capability equivalent to that required by RTCA/DO-208 paragraph 2.2.1.3 for the appropriate equipment class (B1/B3 or B2/B4).
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