diff --git a/gui-ts/src/styles.css b/gui-ts/src/styles.css
index 84690ea..820b712 100644
--- a/gui-ts/src/styles.css
+++ b/gui-ts/src/styles.css
@@ -149,6 +149,8 @@ html, body, #root {
 @media (max-width: 880px) {
   .tab-grid.two, .tab-grid.three { grid-template-columns: 1fr; }
   .panel-row { grid-template-columns: 140px 1fr; }
+  .action-row-inline { flex-direction: column; align-items: stretch; }
+  .action-row-inline .btn { width: 100%; }
 }
 
 /* Inputs */
@@ -202,6 +204,10 @@ html, body, #root {
   align-items: center;
   margin: 4px 0 8px 0;
 }
+.action-row-inline {
+  justify-content: flex-end;
+  margin: 0;
+}
 .action-row { display: flex; justify-content: flex-end; gap: 8px; padding-top: 10px; }
 
 /* Tables */
@@ -241,8 +247,43 @@ html, body, #root {
   outline-offset: -1px;
   background: rgba(56, 189, 248, 0.1);
 }
+.data-table tbody tr:focus-within td {
+  background: rgba(56, 189, 248, 0.08);
+}
 .data-table tbody td .panel-input { padding: 3px 6px; font-size: 11px; }
 .data-table .empty-row { text-align: center; color: var(--text-muted); padding: 18px; }
+.data-table-compact thead th { padding: 4px 6px; font-size: 11px; }
+.data-table-compact tbody td { padding: 2px 4px; }
+.data-table-compact tbody td .panel-input { padding: 2px 4px; font-size: 10px; }
+
+.table-actions-col {
+  position: sticky;
+  right: 0;
+  z-index: 2;
+  background: var(--panel-3);
+  box-shadow: -1px 0 0 var(--border);
+}
+.data-table thead .table-actions-col {
+  background: var(--panel);
+  z-index: 3;
+}
+.data-table tbody tr:focus-within .table-actions-col,
+.data-table tbody tr.row-selected .table-actions-col {
+  background: #162338;
+}
+
+.data-table .btn:focus-visible,
+.data-table .panel-input:focus-visible,
+.data-table select:focus-visible,
+.data-table input[type="checkbox"]:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 1px;
+  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.18);
+}
+
+.data-table-compact .btn {
+  min-height: 24px;
+}
 
 /* KPI grid */
 .kpi-grid {
@@ -338,6 +379,18 @@ html, body, #root {
 .uplot-host .u-legend { color: var(--text-dim); font-size: 11px; }
 .uplot-host .u-wrap   { background: var(--panel-3); }
 
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
 /* 3D wellbore */
 .wellbore-3d-wrap {
   border: 1px solid var(--border);
diff --git a/gui-ts/src/ui/common/CheckboxField.tsx b/gui-ts/src/ui/common/CheckboxField.tsx
index fd82aef..732ca42 100644
--- a/gui-ts/src/ui/common/CheckboxField.tsx
+++ b/gui-ts/src/ui/common/CheckboxField.tsx
@@ -4,6 +4,7 @@ export type CheckboxFieldProps = {
   onChange: (checked: boolean) => void;
   label?: string;
   disabled?: boolean;
+  ariaLabel?: string;
 };
 
 export function CheckboxField(props: CheckboxFieldProps) {
@@ -12,6 +13,7 @@ export function CheckboxField(props: CheckboxFieldProps) {
       <input
         id={props.id}
         type="checkbox"
+        aria-label={props.ariaLabel}
         checked={props.checked}
         disabled={props.disabled}
         onChange={(e) => props.onChange(e.target.checked)}
diff --git a/gui-ts/src/ui/tabs/FluidTab.tsx b/gui-ts/src/ui/tabs/FluidTab.tsx
index 7d8a97d..652eeeb 100644
--- a/gui-ts/src/ui/tabs/FluidTab.tsx
+++ b/gui-ts/src/ui/tabs/FluidTab.tsx
@@ -12,6 +12,7 @@ type Props = { store: CaseStore };
 
 export function FluidTab({ store }: Props) {
   const { state, update } = store;
+  const isMetric = state.unitsSelection === 1;
 
   const estimated = useMemo(
     () => ({
@@ -65,7 +66,7 @@ export function FluidTab({ store }: Props) {
           label="Tubing Gradient"
           htmlFor="tubingGrad"
           hint={
-            state.unitsSelection === 1
+            isMetric
               ? "Pa/m when SI (UnitsSelection=1); from XML"
               : "psi/ft imperial oilfield; converted to Pa/m in the API"
           }
@@ -79,16 +80,19 @@ export function FluidTab({ store }: Props) {
         </Row>
         <div className="button-row" style={{ flexWrap: "wrap", gap: 8 }}>
           <button type="button" className="btn" onClick={applyEstimate}>
-            Apply liquid hydrostatic estimate
+            Apply estimate to Tubing Gradient
           </button>
           <span className="panel-note">
             Heuristic bulk-liquid ρ(water cut, API, water SG) → gradient ≈{" "}
-            {state.unitsSelection === 1
+            {isMetric
               ? `${estimated.paM.toFixed(1)} Pa/m`
               : `${estimated.psiPerFt.toFixed(4)} psi/ft`}
             . Not wired into the C solve yet (see COMPUTE_PLAN).
           </span>
         </div>
+        <p className="panel-note" style={{ marginTop: 4 }}>
+          Dual reference: {estimated.psiPerFt.toFixed(4)} psi/ft · {estimated.paM.toFixed(1)} Pa/m
+        </p>
       </Fieldset>
     </div>
   );
diff --git a/gui-ts/src/ui/tabs/PumpTab.tsx b/gui-ts/src/ui/tabs/PumpTab.tsx
index 30cf6cb..d617eba 100644
--- a/gui-ts/src/ui/tabs/PumpTab.tsx
+++ b/gui-ts/src/ui/tabs/PumpTab.tsx
@@ -14,6 +14,7 @@ type Props = { store: CaseStore };
 
 export function PumpTab({ store }: Props) {
   const { state, update } = store;
+  const isMetric = state.unitsSelection === 1;
 
   const pumpOptions = useMemo(() => {
     const mmVals = PUMP_PLUNGER_INCH_OPTIONS.map((inchVal) => pumpDiameterMmFromInches(inchVal));
@@ -37,7 +38,11 @@ export function PumpTab({ store }: Props) {
         <Row
           label="Plunger diameter"
           htmlFor="plungerDiam"
-          hint="Stored as mm in the case file when above 2 (same convention as rod OD)."
+          hint={
+            isMetric
+              ? "Metric-first display with imperial equivalent in each option."
+              : "Imperial-first display with metric equivalent in each option."
+          }
         >
           <SelectField
             id="plungerDiam"
@@ -47,7 +52,11 @@ export function PumpTab({ store }: Props) {
             ariaLabel="Pump plunger diameter"
           />
         </Row>
-        <Row label="Pump Friction" htmlFor="pumpFric" hint="lbf (imperial)">
+        <Row
+          label="Pump Friction"
+          htmlFor="pumpFric"
+          hint={isMetric ? "N (SI case)" : "lbf (imperial oilfield case)"}
+        >
           <NumberField
             id="pumpFric"
             value={state.pumpFriction}
@@ -55,7 +64,11 @@ export function PumpTab({ store }: Props) {
             onChange={(v) => update("pumpFriction", v)}
           />
         </Row>
-        <Row label="Pump Intake Pressure" htmlFor="pumpIntake" hint="psi (imperial)">
+        <Row
+          label="Pump Intake Pressure"
+          htmlFor="pumpIntake"
+          hint={isMetric ? "Pa (SI case)" : "psi (imperial oilfield case)"}
+        >
           <NumberField
             id="pumpIntake"
             value={state.pumpIntakePressure}
diff --git a/gui-ts/src/ui/tabs/ResultsTab.tsx b/gui-ts/src/ui/tabs/ResultsTab.tsx
index a3bc183..c105564 100644
--- a/gui-ts/src/ui/tabs/ResultsTab.tsx
+++ b/gui-ts/src/ui/tabs/ResultsTab.tsx
@@ -89,9 +89,23 @@ export function ResultsTab({
   const fdm = result?.solvers?.fdm ?? primary ?? null;
   const [overlayMode, setOverlayMode] = useState<OverlayMode>("depth");
   const [selectedSegment, setSelectedSegment] = useState<number | null>(null);
+  const [traceabilityQuery, setTraceabilityQuery] = useState("");
+  const dlsUnitLabel = caseState.unitsSelection === 1 ? "deg/100 m" : "deg/100 ft";
   const trajectorySegments = useMemo(() => buildTrajectorySegments(caseState.survey), [caseState.survey]);
   const sideLoadProfile = primary?.profiles?.sideLoadProfile ?? null;
   const pumpDiag = useMemo(() => computePumpPlacement(caseState), [caseState]);
+  const filteredTraceability = useMemo(() => {
+    const fields = result?.fieldTraceability?.fields ?? [];
+    const q = traceabilityQuery.trim().toLowerCase();
+    if (!q) return fields;
+    return fields.filter((row) => {
+      return (
+        row.xmlKey.toLowerCase().includes(q) ||
+        row.category.toLowerCase().includes(q) ||
+        row.notes.toLowerCase().includes(q)
+      );
+    });
+  }, [result?.fieldTraceability?.fields, traceabilityQuery]);
 
   const dynacardData = useMemo<AlignedData | null>(() => {
     const fdmSeries = toSeries(fdm ?? undefined);
@@ -240,8 +254,7 @@ export function ResultsTab({
       </Fieldset>
       <Fieldset legend="Trajectory Analytics">
         <p className="panel-note" style={{ marginBottom: 8 }}>
-          Click a row or 3D segment to cross-highlight. DLS is shown numerically only (deg per
-          100 ft MD).
+          Click a row or 3D segment to cross-highlight. DLS is shown numerically only ({dlsUnitLabel}).
         </p>
         <div className="table-scroll" style={{ maxHeight: 250 }}>
           <table className="data-table">
@@ -251,7 +264,7 @@ export function ResultsTab({
                 <th>MD start</th>
                 <th>MD end</th>
                 <th>ΔMD</th>
-                <th>DLS (deg/100)</th>
+                <th>DLS ({dlsUnitLabel})</th>
               </tr>
             </thead>
             <tbody>
@@ -449,6 +462,18 @@ export function ResultsTab({
                 Categories mirror <code>docs/engineering/field-traceability.md</code> (
                 physics, metadata, parseCalibration, payloadInactive, parsedUnused).
               </p>
+              <div className="button-row" style={{ gap: 8, alignItems: "center" }}>
+                <input
+                  className="panel-input"
+                  value={traceabilityQuery}
+                  placeholder="Filter by XML key/category/notes"
+                  aria-label="Filter traceability rows"
+                  onChange={(e) => setTraceabilityQuery(e.target.value)}
+                />
+                <span className="panel-note">
+                  Showing {filteredTraceability.length} / {result.fieldTraceability.fields.length}
+                </span>
+              </div>
               <div className="table-scroll" style={{ maxHeight: 280 }}>
                 <table className="data-table">
                   <thead>
@@ -456,14 +481,16 @@ export function ResultsTab({
                       <th>XML field</th>
                       <th>Category</th>
                       <th>In file</th>
+                      <th>Notes</th>
                     </tr>
                   </thead>
                   <tbody>
-                    {result.fieldTraceability.fields.map((row) => (
+                    {filteredTraceability.map((row) => (
                       <tr key={row.xmlKey} title={row.notes || undefined}>
                         <td className="mono">{row.xmlKey}</td>
                         <td>{row.category}</td>
                         <td>{row.presentInXml ? "yes" : "—"}</td>
+                        <td>{row.notes}</td>
                       </tr>
                     ))}
                   </tbody>
diff --git a/gui-ts/src/ui/tabs/RodStringTab.tsx b/gui-ts/src/ui/tabs/RodStringTab.tsx
index c499d89..4335de1 100644
--- a/gui-ts/src/ui/tabs/RodStringTab.tsx
+++ b/gui-ts/src/ui/tabs/RodStringTab.tsx
@@ -57,6 +57,7 @@ function diameterOptionsFor(rowDiameter: number) {
 export function RodStringTab({ store }: Props) {
   const { state, addTaperRow, removeTaperRow, updateTaperRow, setTaper, update } = store;
   const [taperLengthMode, setTaperLengthMode] = useState<"length" | "count">("length");
+  const [compactRows, setCompactRows] = useState(false);
 
   const depthUnit = state.unitsSelection === 1 ? "m" : "ft";
 
@@ -102,6 +103,13 @@ export function RodStringTab({ store }: Props) {
         <abbr title="Approximate catalog values for workflow only">heuristic</abbr> — verify for
         your vendor tables.
       </p>
+      {taperLengthMode === "count" && (
+        <p className="panel-note">
+          Joint counts are converted using <code>RodLengthForSteel</code> /{" "}
+          <code>RodLengthForFiberglass</code> from the case (fallbacks: 25 ft / 37.5 ft in
+          imperial). Non-integer equivalent counts are allowed.
+        </p>
+      )}
 
       <div className="button-row">
         <span className="panel-note">Section length:</span>
@@ -119,6 +127,15 @@ export function RodStringTab({ store }: Props) {
         >
           Joint count
         </button>
+        <button
+          type="button"
+          className={`btn ${compactRows ? "btn-primary" : ""}`}
+          onClick={() => setCompactRows((v) => !v)}
+          aria-pressed={compactRows}
+          aria-label={compactRows ? "Disable compact rows in rod table" : "Enable compact rows in rod table"}
+        >
+          {compactRows ? "Compact rows: ON" : "Compact rows: OFF"}
+        </button>
         <button type="button" className="btn" onClick={() => addTaperRow()}>
           Add Section
         </button>
@@ -133,9 +150,12 @@ export function RodStringTab({ store }: Props) {
           {totals.length.toFixed(1)} {depthUnit}
         </span>
       </div>
+      <p className="sr-only" aria-live="polite">
+        Rod table compact mode is {compactRows ? "enabled" : "disabled"}.
+      </p>
 
       <div className="table-scroll">
-        <table className="data-table">
+        <table className={`data-table ${compactRows ? "data-table-compact" : ""}`}>
           <thead>
             <tr>
               <th style={{ width: 36 }}>#</th>
@@ -148,8 +168,8 @@ export function RodStringTab({ store }: Props) {
               <th>Guide</th>
               <th># guides</th>
               <th>Guide type</th>
-              <th>Rod guide wt</th>
-              <th style={{ width: 56 }}></th>
+              <th>Guide wt (lb/ft)</th>
+              <th className="table-actions-col" style={{ width: 56 }}></th>
             </tr>
           </thead>
           <tbody>
@@ -221,6 +241,7 @@ export function RodStringTab({ store }: Props) {
                     <CheckboxField
                       id={`taper-${i}-guides`}
                       label=""
+                      ariaLabel={`Enable guides for taper ${i + 1}`}
                       checked={row.guidesEnabled}
                       onChange={(checked) =>
                         updateTaperRow(i, {
@@ -244,6 +265,7 @@ export function RodStringTab({ store }: Props) {
                     <SelectField
                       value={row.guideTypeToken}
                       options={GUIDE_TYPE_OPTIONS}
+                      disabled={!row.guidesEnabled}
                       onChange={(v) => updateTaperRow(i, { guideTypeToken: v })}
                       ariaLabel={`Taper ${i + 1} guide type`}
                     />
@@ -252,16 +274,18 @@ export function RodStringTab({ store }: Props) {
                     <NumberField
                       value={row.rodGuideWeightLbfPerFt}
                       step={0.01}
+                      disabled={!row.guidesEnabled}
                       onChange={(v) => updateTaperRow(i, { rodGuideWeightLbfPerFt: v })}
                       ariaLabel={`Taper ${i + 1} rod guide weight`}
                     />
                   </td>
-                  <td>
+                  <td className="table-actions-col">
                     <button
                       type="button"
                       className="btn btn-danger"
                       onClick={() => removeTaperRow(i)}
                       aria-label={`Remove taper ${i + 1}`}
+                      title={`Remove taper row ${i + 1}`}
                     >
                       ✕
                     </button>
diff --git a/gui-ts/src/ui/tabs/TrajectoryTab.tsx b/gui-ts/src/ui/tabs/TrajectoryTab.tsx
index 09fc2d4..ccde9f8 100644
--- a/gui-ts/src/ui/tabs/TrajectoryTab.tsx
+++ b/gui-ts/src/ui/tabs/TrajectoryTab.tsx
@@ -1,3 +1,4 @@
+import { useState } from "react";
 import type { CaseStore } from "../../state/useCaseStore";
 import { Fieldset } from "../common/Fieldset";
 import { NumberField } from "../common/NumberField";
@@ -7,6 +8,7 @@ type Props = { store: CaseStore };
 export function TrajectoryTab({ store }: Props) {
   const { state, addSurveyRow, insertSurveyRowBelow, removeSurveyRow, updateSurveyRow, setSurvey } =
     store;
+  const [compactRows, setCompactRows] = useState(false);
 
   function loadVertical() {
     const depth = state.pumpDepth || 1727;
@@ -40,6 +42,10 @@ export function TrajectoryTab({ store }: Props) {
         Enter survey stations from surface to TD. Minimum curvature method (API
         Bulletin D20) is applied in the solver. First row should be 0 MD, 0 Inc, 0 Az.
       </p>
+      <p className="panel-note">
+        Use <strong>Insert below</strong> to add stations mid-trajectory without rebuilding the
+        full table.
+      </p>
       <div className="button-row">
         <button type="button" className="btn" onClick={() => addSurveyRow()}>
           Add Station
@@ -53,20 +59,34 @@ export function TrajectoryTab({ store }: Props) {
         <button type="button" className="btn" onClick={loadDeviatedExample}>
           Load Deviated Example
         </button>
+        <button
+          type="button"
+          className={`btn ${compactRows ? "btn-primary" : ""}`}
+          onClick={() => setCompactRows((v) => !v)}
+          aria-pressed={compactRows}
+          aria-label={
+            compactRows ? "Disable compact rows in trajectory table" : "Enable compact rows in trajectory table"
+          }
+        >
+          {compactRows ? "Compact rows: ON" : "Compact rows: OFF"}
+        </button>
         <span className="panel-note" style={{ marginLeft: "auto" }}>
           {state.survey.length} station{state.survey.length === 1 ? "" : "s"}
         </span>
       </div>
+      <p className="sr-only" aria-live="polite">
+        Trajectory table compact mode is {compactRows ? "enabled" : "disabled"}.
+      </p>
 
       <div className="table-scroll">
-        <table className="data-table">
+        <table className={`data-table ${compactRows ? "data-table-compact" : ""}`}>
           <thead>
             <tr>
               <th style={{ width: 40 }}>#</th>
               <th>MD</th>
               <th>Inclination (°)</th>
               <th>Azimuth (°)</th>
-              <th style={{ width: 120 }}>Actions</th>
+              <th className="table-actions-col" style={{ width: 120 }}>Actions</th>
             </tr>
           </thead>
           <tbody>
@@ -100,13 +120,14 @@ export function TrajectoryTab({ store }: Props) {
                     ariaLabel={`Azi ${i + 1}`}
                   />
                 </td>
-                <td>
-                  <div className="button-row" style={{ gap: 4 }}>
+                <td className="table-actions-col">
+                  <div className="button-row action-row-inline" style={{ gap: 4 }}>
                     <button
                       type="button"
                       className="btn"
                       onClick={() => insertSurveyRowBelow(i)}
                       title="Insert a station after this row"
+                      aria-label={`Insert station below row ${i + 1}`}
                     >
                       Insert below
                     </button>
@@ -124,7 +145,7 @@ export function TrajectoryTab({ store }: Props) {
             ))}
             {state.survey.length === 0 && (
               <tr>
-                <td colSpan={6} className="empty-row">
+                <td colSpan={5} className="empty-row">
                   No survey stations. Add rows or load a preset.
                 </td>
               </tr>