One tap turns on location and the compass: weather fills itself, and the wind dial sets itself when you point the phone at the pin. Your phone will show two quick permission prompts.
Carry numbers for the full bag. The middle column is the stock number.
All figures in yards
Put your own carry numbers in. They save on this phone and nowhere else. Clear a club's name to drop that row; type the name back to bring it in again. Add & reorder adds clubs, moves them, and removes one for good; Start over brings back the bag this app shipped with.
Set the recorded-at conditions first. The app treats every number below as a still-air carry taken at those conditions, then adjusts from there. Leave them on a mile-high day when your numbers came from sea level and every row reads low.
The code is your bag as one line of text. Copy it into a note and you can put the bag back on a new phone, or send it to somebody who plays your numbers. Loading a code replaces every club below.
Baseline. Every stored number counts as a still-air carry recorded at the conditions set under My bag, which this bag puts at 5,280 ft, 85°F, 25% RH. With the playing inputs sitting on that baseline the table is unchanged. The shipped bag was recorded at 5,280 ft, 85°F, and a stated low humidity; 25% is the assumption, worth under a quarter yard.
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 every club; 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.