Club Distances

Baseline. Every stored number was recorded at 5,280 ft, 85°F, 25% RH (stated as low humidity; 25% assumed, sub-quarter-yard effect), zero wind. With inputs at the baseline the table is unchanged.

Altitude. +1.16% carry per 1,000 ft (Titleist). Denver 5,280 ft = +6.1%, not the often-quoted 12-15%, which describes air density, not carry.

Temperature. +1% carry per 10°F above a 75°F reference (TrackMan, about 2 yards per club per 10°F).

Humidity. +1% across the full 0-100% range (TrackMan: 10% to 90% RH moves a 6-iron under one yard).

Wind. One dial: the arrow points the way the wind blows, the shot plays to 12. The along component uses the TrackMan rules: into it a shot plays 1% longer per mph, so displayed carry divides by (1 + 0.01 × mph); downwind it plays 0.5% shorter per mph, divisor (1 - 0.005 × mph), capped at 40. A headwind hurts twice what a tailwind helps.

Crosswind. The across component changes aim, not carry: drift is 10 ft per 100 yd per 10 mph (GolfWRX, Golf Monthly), shown per 100 of carry, the same number in yards or meters.

Slope. One yard per yard of elevation change: the shot box adds or subtracts feet ÷ 3 to the target before picking clubs.

Units. 1 yd = 0.9144 m. Inputs stay in ft / °F / mph in either mode.

Weather. The location button pulls current conditions from open-meteo.com and fills elevation, temperature, humidity, and wind speed. Wind direction stays yours: a weather station knows the compass bearing, never your target line. The elevation is the station's, so a saved course chip tapped afterward overrides it. Needs a signal; any failure leaves the fields untouched. Your coordinates go only to that one service, rounded to about a city block.

Model limits. One flat percentage for all 14 clubs; a driver truly gains slightly more from thin air than a wedge. Carry only; roll is not modeled. Wind clears itself after six idle hours; course constants keep.