Choose manual range data or airport weather

Prefer the observation that represents the range. A current measurement at the firing location is usually easier to defend than a remote observation when the instrument and method are trustworthy. Evaluate an airport before adopting it. Compare distance, elevation, terrain, sun exposure, observation time, and whether conditions are changing between the airport and range. Treat atmosphere and wind separately. Airport temperature and pressure may be useful while its wind is unrepresentative of the firing point or target path. Do not adopt both merely because they arrived together. Preserve the fallback. A failed refresh should leave the accepted conditions intact. Use manual entry when service is unavailable and you have a better local observation. Re-check source and time. After any update, confirm the displayed source, confidence, timestamp, and the resulting accepted solution. Refresh when the decision changes. Conditions used for morning preparation may not represent a later stage. Reassess when weather, location, or the consequence of the shot changes.

Nearest does not mean same air or same wind. Terrain, elevation, shade, valley flow, and observation age can make a nearby airport materially different from the range.

Expected result. The active atmosphere and wind each have a deliberate, recognizable source appropriate to the decision they support.