The five greek maps on your chart

In Part 1 you met the Greeks one at a time as forces. The selector is where they become views: the same per-strike snapshot, projected through whichever Greek you choose, painted as bands on your chart. Nothing new is measured — you are re-asking the one chain a different question. The entire skill of this lesson is matching the question to the day, because five maps at once is not five times the insight; it is one unreadable chart.

The five maps, by the question they answer

• Gamma — "will moves be dampened or amplified here?" The classic read from Part 1: green bands where dealer hedging leans against price, red where it feeds moves. This is the map you should default to, because regime is the single most useful thing to know before you trade.
• Delta (DEX) — "how directional is the book by strike?" Violet vs red bands show where the dealers' directional inventory concentrates — useful context for whether a push has to fight standing hedges or runs with them.
• Vanna — "what happens when volatility moves?" Vanna is the bridge between IV and delta (Lesson 11). Its bands mark strikes where a vol change forces delta re-hedging — the fuel behind some of the sharpest moves on IV-shift days, and near-invisible on a calm one.
• Vega — "where does vol exposure live?" Teal bands where the book gains from rising IV, rose where it loses. Densest near the money; most interesting when it is not, because an off-strike vega cluster tells you where an IV move would bite hardest.
• Charm — "what does time do to the hedges?" Charm is delta decay (Lesson 11). Into the afternoon, charm bands mark where hedges must be unwound simply because the clock ran — one mechanical ingredient of late-day drift.

Why they are not redundant

It is fair to ask why five maps of the same chain are not just five colours of the same thing. The answer is that each Greek responds to a different input. Gamma answers to price, charm to time, vanna and vega to volatility, delta to direction outright. On a flat, quiet day the price-driven map (gamma) carries almost all the information and the others are near-empty. On a day when IV is lurching, the volatility maps light up with structure the gamma map cannot show, because they are reading a force gamma is blind to. The maps are not redundant; they are specialists, and the art is knowing whose day it is.

A workable routine

Most sessions need one map, sometimes two. A common pairing: gamma for the regime you are trading in, plus one situational map — vanna on a day when IV is moving hard, charm into the last two hours, vega around events. Five maps at once is noise wearing a uniform. A useful discipline is to pick your second map before the open, as part of your thesis: if today's story has a volatility leg, you have already decided vanna earns its place; if it is a quiet range, gamma alone is the honest choice. Choosing the map after price moves is usually a way of hunting for a colour that agrees with what you already did.

Reading two maps against each other

The richest use of the selector is not one map at a time but two in deliberate contrast. Find a strike where gamma is heavy but delta is light, and you have a place price should stall without a strong directional push behind the stall — a classic fade condition. Find the reverse, heavy delta and light gamma, and you have a strike with directional inventory but little dampening, a place a move can run once it starts. The disagreement between two maps is often more informative than either map's brightest band, because it describes a combination of conditions rather than a single one.

The mistake to avoid

The beginner's error is collection: turning on all five because each is interesting, then trading none of them because the chart is a bruise of overlapping colour. Interesting is not the bar — decision-changing is. If you cannot say, before you enable a map, what you would do differently based on what it shows, leave it off. A second map is a second question; ask it only when the day actually poses it.

Each map on its own day

The specialists earn their keep on specific days, and it helps to picture the day each was built for. Gamma is the everyday map: on a calm, range-bound session it will show you exactly why every push fades, and that alone often settles whether to fade or stand aside. Delta comes into its own on a trending open, when you want to know whether price is running with the book's directional inventory or grinding against it. Vanna is a rare-day map — it sits quiet until implied volatility actually moves, and then it lights up the strikes where a vol shift forces the sharpest re-hedging, which is why big IV days can produce moves that the gamma map alone never warned you about. Vega is the map to check before a scheduled event, when you want to know where the book is most exposed to a change in volatility rather than price. Charm is an afternoon map: it means little at the open and grows more relevant with every hour, marking the strikes where hedges must be unwound purely because the clock ran down. Learn which day each was built for, and you will reach for the right one without hunting.

When a map is quiet, believe it

Beginners distrust an empty map and assume they have the wrong setting; often the emptiness is the message. A near-blank vanna map is telling you volatility is not the story today, and that is genuinely useful — it means you can stop watching for a vol-driven move and trade the gamma regime in peace. The maps are specialists, and a specialist with nothing to say is data, not a malfunction. The mistake is to keep flipping maps until one of them shows a bright band, then trade that band as if you had discovered something; all you discovered was the one Greek that happened to have structure today, which may have nothing to do with what is actually driving price. Let the quiet maps be quiet.

Two more pairings worth knowing

Beyond gamma-plus-one, two combinations come up often enough to name. Into the final two hours, gamma with charm is a natural pair: gamma tells you whether moves are being dampened, charm tells you where the day's mechanical hedge-unwind is concentrated, and together they explain a good share of late-session drift that looks directional but is really the clock talking. On a scheduled-event day, vega with vanna is the pair to run: vega shows where the book is most exposed to a volatility change, vanna shows where that change would force the hardest delta re-hedging, and the two together frame how a vol shock would propagate into price. Neither pairing is a signal — both are still context — but each answers a specific day's question more completely than a single map could. The lesson underneath all of this is the same: choose your maps to fit the day's story, and keep the count as low as the story allows.

A final principle ties the five maps together and is worth carrying out of this lesson above any single one of them. The number of maps you have open is a rough inverse measure of how well you understand the day. A trader who knows exactly what is driving the session needs one map, occasionally two, because they already know which question matters and reach straight for the Greek that answers it. A trader flipping restlessly through all five is usually not being thorough — they are searching for a story, and a chart is always willing to sell one to someone who wants it badly enough. Fewer maps, chosen on purpose, is not a limitation you are settling for; it is what mastery of this tool actually looks like. When you find yourself reaching for a third map mid-session, treat it as a signal about the trade, not about the chart: it usually means your thesis was thin, and the honest move is to step back, not to add colour.