When picking an alternate when creating a new flight using Navigraph, what is the sort order for alternate airports for your destination?
Hi, alternates are sorted the same way as they are in SimBrief. From the SimBrief User Guide, the logic is as follows:
When more than one possible alternate airport is found, SimBrief prioritizes them on how well equipped they are (how many ILS approaches and runways they have) and how far away they are (favoring airports located at about half of the search distance, while also avoiding airports which are too close). It also generally prefers alternate airports within the same country and avoids using military airports if possible.
When considering the lowest ceiling and visibility options, SimBrief looks at each airport’s TAF for the period from 1 hour before to 4 hours after the estimated time you would arrive at that airport. It notes the lowest ceiling and visibility during that time period and excludes any airports that fall below the minimum values you have set.
Note however that in Charts, airports are not excluded based on forecast weather unless you activate the “Filters” option.
Also, charts uses a fixed search distance of 400nm, which means it considers airports closer than 40nm to be “close” and airports farther than 200nm to be “far”. “Close” and “far” airports will be prioritized lower in the list.
Best regards,
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Brilliant, many thanks!
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