After losing half my hair, I have cornered the culprit.
FS2024 gets confused if a flight plan has multiple waypoints with the same identification.
That identification can be either:
1) a bona-fide ICAO Ident, used twice in a flight plan - even when generated correctly by SimBrief!
2) an automatic waypoint ID (when there is no ICAO ID) which is generated as "DDMMxDDDMMy"
=> here DD/DDD is Degrees, MM is Minutes and 'x' is N/S and 'y' is E/W - compressed from the actual World Coordinates
In all cases, whenever the flight-plan generates duplicate identifiers, the resulting flight plan is corrupted in the Avionics, and also, sometimes, already in the World Map, before "Ready to Fly"
The simplest and most obvious case is visible in the attached example as per example 1) above:
1) SimBrief plan from MYNN to MYEH with a loop starting at waypoint 'MAPRE' - through 'JEDIK' and 'FILAB' before rejoining 'MAPRE'.
Since Waypoint 'MAPRE' is included twice in the FlightPlan, FS24 EFB decides to ignore both occurences, even though SimBrief created them.
Note that in FS2020, the same SimBrief plan is registered correctly in World Map and Avionics.
Edit: In FS2020, the SimBrief plan must be saved in FS2020 format- FS2020 cannot read FS2024 format - also, the two 'MAPRE' waypoints are actually registered as 'USR01' and 'USR02' albeit correctly positioned.
2) No need to supply further, more complex, examples until situation 1) is clarified and/or corrected (there are quite a few of those...).
FS2024 gets confused if a flight plan has multiple waypoints with the same identification.
That identification can be either:
1) a bona-fide ICAO Ident, used twice in a flight plan - even when generated correctly by SimBrief!
2) an automatic waypoint ID (when there is no ICAO ID) which is generated as "DDMMxDDDMMy"
=> here DD/DDD is Degrees, MM is Minutes and 'x' is N/S and 'y' is E/W - compressed from the actual World Coordinates
In all cases, whenever the flight-plan generates duplicate identifiers, the resulting flight plan is corrupted in the Avionics, and also, sometimes, already in the World Map, before "Ready to Fly"
The simplest and most obvious case is visible in the attached example as per example 1) above:
1) SimBrief plan from MYNN to MYEH with a loop starting at waypoint 'MAPRE' - through 'JEDIK' and 'FILAB' before rejoining 'MAPRE'.
Since Waypoint 'MAPRE' is included twice in the FlightPlan, FS24 EFB decides to ignore both occurences, even though SimBrief created them.
Note that in FS2020, the same SimBrief plan is registered correctly in World Map and Avionics.
Edit: In FS2020, the SimBrief plan must be saved in FS2020 format- FS2020 cannot read FS2024 format - also, the two 'MAPRE' waypoints are actually registered as 'USR01' and 'USR02' albeit correctly positioned.
2) No need to supply further, more complex, examples until situation 1) is clarified and/or corrected (there are quite a few of those...).
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