iOS map — pins, wind, sampling

The iOS app ships a dedicated airport map in addition to the SIGMET map. Pins are circles coloured by flight category (VFR green, MVFR blue, IFR red, LIFR purple) with a plane icon. An orange ring signals an active SIGMET within 200 NM.

BBox loading

Each pan/zoom triggers a 400 ms debounced METAR fetch for the visible bounding box. If you barely moved (<25% of the span) the fetch is skipped to save API calls.

Wide-zoom sampling

• Span > 40°: major international only (priority ≥ 3), 3.3° spacing
• Span 20–40°: medium+ (priority ≥ 2), 1.8° spacing
• Span 12–20°: small commercial+ (priority ≥ 1), 1.3° spacing
• Span ≤ 12°: all airports, 0.5° spacing, up to 40 pins

Wind barbs

Toggle from the wind icon top-right. When on, shows wind at the selected level (SFC, FL030, FL060, FL090, FL180). Surface from METAR, upper levels from NOAA windtemp. Standard aviation convention — shaft = direction, barb = speed (10 kt full, 5 kt half, 50 kt triangle).