Scotflieger 32 Posted October 16, 2014 Share Posted October 16, 2014 I hope I'm not the first person to break v1.10. When approaching a turning point flying level at FL120 I pressed the ALT knob to engage ALT Managed mode. At this point the route on the ND which had been showing a left turn at the GOSAM waypoint, changed to a loop to right starting with a reverse right turn. The route anomaly remained in both ARC and NAV mode. The aircraft started to fly the wrong route until it came close to the turning point then routed to the next waypoint correctly. Link to comment Share on other sites More sharing options...
Aerosoft Jonas S. 466 Posted October 16, 2014 Aerosoft Share Posted October 16, 2014 Hey, can you provide the route you've been flying? Also interesting is your navdata base. Are you using NDP or Navigraph and which airac? Jonas Link to comment Share on other sites More sharing options...
Aerosoft Aerosoft Team [Inactive Account] 51558 Posted October 16, 2014 Aerosoft Share Posted October 16, 2014 Lol, that for sure is the Bus being artistic. It's not an issue related to 1.10 but rather one of our 'standard' misinterpretations of the database. If you send the procedure you loaded we'll try it out. Link to comment Share on other sites More sharing options...
Scotflieger 32 Posted October 16, 2014 Author Share Posted October 16, 2014 It was a flight test route I use out of Edinburgh comprising a linked SID and STAR. Using latest NavDataPro 16OCT12NOV/14 (installed because I was unable to unzip early error with 1.10). EGPH RWY 24 - SID GOSA1C 635 UW ITH95 ITH14 MAVIX GOSAN - STAR TWEE2A MARGO INPIP INREV ESKDO 10TLA TARTN TWEED ITH90 ITH 40 EGPH ILS24 - max FL220 All F-PLN DISCONTINUITY lines cleared. Link to comment Share on other sites More sharing options...
Scotflieger 32 Posted October 20, 2014 Author Share Posted October 20, 2014 Another example for your collection. Climbing out of EGPH on SID GOSA1C (SID GOSA1C 635 UW ITH95 ITH14 MAVIX GOSAN) I had to change to HDG set mode. On selecting DIRECT steer to ITH14 a complete 360 deg loop was drawn on the ND. Link to comment Share on other sites More sharing options...
Aerosoft Aerosoft Team [Inactive Account] 51558 Posted October 20, 2014 Aerosoft Share Posted October 20, 2014 What did the bus do? Follow the circle or fly the right route? Link to comment Share on other sites More sharing options...
Scotflieger 32 Posted October 20, 2014 Author Share Posted October 20, 2014 It started to follow the loop but as it passed close to the waypoint (ITH14) the Nav system switched to the following waypoint (MAVIX) and returned to the planned route. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
Aerosoft Aerosoft Team [Inactive Account] 51558 Posted October 20, 2014 Aerosoft Share Posted October 20, 2014 It started to follow the loop but as it passed close to the waypoint (ITH14) the Nav system switched to the following waypoint (MAVIX) and returned to the planned route. Sent from my iPad using Tapatalk You know the real bus does the same? Often it starts on the incorrect path but then decides it is silly and flies the right route. Link to comment Share on other sites More sharing options...
Scotflieger 32 Posted October 20, 2014 Author Share Posted October 20, 2014 I believe it is the proximity condition to the waypoint that is deciding to select the next waypoint that sorted out the route. However, as a previous specifier and designer of navigation software, there appears to be a big anomaly in the model that is calculating the right hand loop to arrive at the waypoint rather than the direct or left radius turn onto the direct track between the next and following waypoints. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
PikalaxALT 19 Posted October 23, 2014 Share Posted October 23, 2014 Indeed. I have no personal knowledge of how the curves are plotted, but I imagine it should go something like this: * Waypoints are plotted in spherical space. Great circle arcs (minimum distance path between two points on the surface of a sphere) are added to connect the waypoints. * Circles no smaller than a predetermined minimum radius (corresponding to a 30-degree bank at the expected speed) are placed near each waypoint on the inside angle such that they lie tangent to (extensions of) these lines. The smallest feasible circle is selected. * If two circles intersect each other between where they touch the straight-line path, a third circle is placed to be inside tangent to both circles. Repeat recursively as necessary. In this manner, one can produce a smooth path in spherical geometry that minimizes both total length and total deviation from waypoints. Link to comment Share on other sites More sharing options...
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