diff --git a/app.json b/app.json
index 4f79077..243484a 100644
--- a/app.json
+++ b/app.json
@@ -19,8 +19,7 @@
       }
     },
         "android": {
-      "usesCleartextTraffic": true,
-      "adaptiveIcon": {
+          "adaptiveIcon": {
         "foregroundImage": "./assets/images/android-icon-monochrome.png",
         "backgroundColor": "#ffffff"
       },
diff --git a/server/server.js b/server/server.js
index 1653266..3d068a9 100644
--- a/server/server.js
+++ b/server/server.js
@@ -209,6 +209,7 @@ addRoute('POST', '/groups', async (req, res) => {
         CreatedByUid: payload.CreatedByUid,
         MaxMemberSubgroups: payload.MaxMemberSubgroups || 1,
         TeamsEnabled: payload.TeamsEnabled !== undefined ? payload.TeamsEnabled : true,
+        CacheTriggerMeters: payload.CacheTriggerMeters || 20,
         ApprovedAdmins: [payload.CreatedByUid],
         CreatedAt: new Date().toISOString(),
     };
diff --git a/src/components/gameplay/AdminCacheEditorView.js b/src/components/gameplay/AdminCacheEditorView.js
index 944106d..b15c6f3 100644
--- a/src/components/gameplay/AdminCacheEditorView.js
+++ b/src/components/gameplay/AdminCacheEditorView.js
@@ -1,7 +1,7 @@
 import React from 'react';
 import MapView, {Circle, Marker} from 'react-native-maps';
 
-const AdminCacheEditorView = ({ userLocation, caches, onAddCache, onMoveCache }) => {
+const AdminCacheEditorView = ({ userLocation, caches, claimDistance, onAddCache, onMoveCache }) => {
 //   Initialisation -------------
 //   State ----------------------
 //   Handlers -------------------
@@ -34,7 +34,7 @@ const AdminCacheEditorView = ({ userLocation, caches, onAddCache, onMoveCache })
           />
           <Circle
             center={cache.coordinates}
-            radius={cache.radius}
+            radius={claimDistance}
             fillColor="rgba(59, 130, 246, 0.15)"
             strokeColor="rgba(59, 130, 246, 0.85)"
           />
diff --git a/src/components/gameplay/ClaimTimerView.js b/src/components/gameplay/ClaimTimerView.js
index 68076a8..c38315a 100644
--- a/src/components/gameplay/ClaimTimerView.js
+++ b/src/components/gameplay/ClaimTimerView.js
@@ -1,11 +1,12 @@
 import React, {useEffect, useState} from 'react';
 import {StyleSheet, Text, View} from 'react-native';
+import {CACHE_CLAIM_TIMER} from '../../utils/geoMath';
 
 const ClaimTimerView = ({ cache, onClaimSuccess, isClaiming }) => {
 //   Initialisation -------------
 //   State ----------------------
 
-  const [timeLeft, setTimeLeft] = useState(5);
+  const [timeLeft, setTimeLeft] = useState(CACHE_CLAIM_TIMER);
 
 //   Handlers -------------------
 
@@ -16,7 +17,7 @@ const ClaimTimerView = ({ cache, onClaimSuccess, isClaiming }) => {
     } else if (isClaiming && timeLeft === 0 && cache) {
       onClaimSuccess(cache.id);
     } else {
-      setTimeLeft(5);
+      setTimeLeft(CACHE_CLAIM_TIMER);
     }
     return () => clearTimeout(timer);
   }, [isClaiming, timeLeft, cache, onClaimSuccess]);
diff --git a/src/components/gameplay/PlayerMapView.js b/src/components/gameplay/PlayerMapView.js
index 7ac9e0c..ffdf860 100644
--- a/src/components/gameplay/PlayerMapView.js
+++ b/src/components/gameplay/PlayerMapView.js
@@ -2,7 +2,7 @@ import React from 'react';
 import MapView, {Circle, Polygon} from 'react-native-maps';
 import {getFovCone} from '../../utils/geoMath';
 
-const PlayerMapView = ({ userLocation, visibleCache, heading }) => {
+const PlayerMapView = ({ userLocation, visibleCache, heading, claimDistance }) => {
 //   Initialisation -------------
 //   State ----------------------
 //   Handlers -------------------
@@ -31,7 +31,7 @@ const PlayerMapView = ({ userLocation, visibleCache, heading }) => {
       {visibleCache ? (
         <Circle
           center={visibleCache.coordinates}
-          radius={visibleCache.radius}
+          radius={claimDistance}
           fillColor="rgba(250, 204, 21, 0.20)"
           strokeColor="rgba(250, 204, 21, 0.90)"
         />
diff --git a/src/components/screens/ExpandedMapScreen.js b/src/components/screens/ExpandedMapScreen.js
index 4f3d41e..01b576d 100644
--- a/src/components/screens/ExpandedMapScreen.js
+++ b/src/components/screens/ExpandedMapScreen.js
@@ -11,8 +11,9 @@ const DEFAULT_REGION = {latitude: 51.5074, longitude: -0.1278, latitudeDelta: 0.
 const ExpandedMapScreen = ({route}) => {
 //   Initialisation ------------
 
-    const {isAdmin, cacheRecords: cacheStr} = route.params || {};
+    const {isAdmin, cacheRecords: cacheStr, claimDistance: routeClaimDistance} = route.params || {};
     const caches = cacheStr ? JSON.parse(cacheStr) : [];
+    const claimDistance = routeClaimDistance || 20;
 
 //   State ----------------------
 
@@ -74,9 +75,9 @@ const ExpandedMapScreen = ({route}) => {
                                 title={cache.name || cache.clue}
                                 pinColor="#2563eb"
                             />
-                            <Circle
+                             <Circle
                                 center={cache.coordinates}
-                                radius={cache.radius}
+                                radius={claimDistance}
                                 fillColor="rgba(59,130,246,0.15)"
                                 strokeColor="rgba(59,130,246,0.85)"
                             />
diff --git a/src/components/screens/GameSettingsScreen.js b/src/components/screens/GameSettingsScreen.js
index d5f2902..41ec274 100644
--- a/src/components/screens/GameSettingsScreen.js
+++ b/src/components/screens/GameSettingsScreen.js
@@ -19,6 +19,7 @@ const GameSettingsScreen = () => {
     const [groupName, setGroupName] = useState('');
     const [teamsEnabled, setTeamsEnabled] = useState(false);
     const [maxSubgroups, setMaxSubgroups] = useState('1');
+    const [cacheTriggerMeters, setCacheTriggerMeters] = useState('20');
     const [adminJoinCode, setAdminJoinCode] = useState('');
     const [memberJoinCode, setMemberJoinCode] = useState('');
 
@@ -35,6 +36,7 @@ const GameSettingsScreen = () => {
                 setGroupName(group.GroupName || '');
                 setTeamsEnabled(Boolean(group.TeamsEnabled));
                 setMaxSubgroups(String(group.MaxMemberSubgroups || 1));
+                setCacheTriggerMeters(String(group.CacheTriggerMeters || 20));
                 setAdminJoinCode(group.AdminJoinCode || '');
             }
             const sgs = await getSubgroups(session.currentGid);
@@ -52,6 +54,7 @@ const GameSettingsScreen = () => {
             GroupName: groupName.trim(),
             TeamsEnabled: teamsEnabled,
             MaxMemberSubgroups: parseInt(maxSubgroups) || 1,
+            CacheTriggerMeters: parseInt(cacheTriggerMeters) || 20,
         });
         setSaving(false);
     };
@@ -112,6 +115,16 @@ const GameSettingsScreen = () => {
                     </>
                 )}
 
+                <Text style={styles.label}>Cache Claim Distance (metres)</Text>
+                <TextInput
+                    style={styles.input}
+                    value={cacheTriggerMeters}
+                    onChangeText={setCacheTriggerMeters}
+                    keyboardType="numeric"
+                    placeholder="20"
+                    placeholderTextColor="#9ca3af"
+                />
+
                 <View style={styles.codeSection}>
                     <Text style={styles.codeLabel}>Admin Join Code</Text>
                     <Text style={styles.codeValue}>{adminJoinCode || '—'}</Text>
diff --git a/src/components/screens/ManageGameScreen.js b/src/components/screens/ManageGameScreen.js
index 1a5530a..af9f962 100644
--- a/src/components/screens/ManageGameScreen.js
+++ b/src/components/screens/ManageGameScreen.js
@@ -10,7 +10,7 @@ const ManageGameScreen = () => {
 //   Initialisation ------------
 
     const session = getSession();
-    const {getCaches, upsertCache} = useGameHook();
+    const {getCaches, upsertCache, getLobby} = useGameHook();
 
 //   State ----------------------
 
@@ -18,6 +18,7 @@ const ManageGameScreen = () => {
     const [loading, setLoading] = useState(true);
     const [error, setError] = useState('');
     const [cacheRecords, setCacheRecords] = useState([]);
+    const [claimDistance, setClaimDistance] = useState(20);
 
 //   Handlers -------------------
 
@@ -32,6 +33,13 @@ const ManageGameScreen = () => {
 
     useEffect(() => { loadCaches(); }, [loadCaches]);
 
+    useEffect(() => {
+        if (!session.currentGid) return;
+        getLobby(session.currentGid).then((group) => {
+            if (group) setClaimDistance(group.CacheTriggerMeters || 20);
+        });
+    }, [session.currentGid]);
+
     useEffect(() => {
         let locationSub;
         const start = async () => {
@@ -62,7 +70,6 @@ const ManageGameScreen = () => {
             gid: session.currentGid,
             latitude: coordinate.latitude,
             longitude: coordinate.longitude,
-            radius: 20,
             clue: `Cache ${cacheRecords.length + 1}`,
             subgroupId: 1,
         });
@@ -78,7 +85,6 @@ const ManageGameScreen = () => {
             cacheId,
             latitude: coordinate.latitude,
             longitude: coordinate.longitude,
-            radius: current.radius,
             clue: current.clue,
             subgroupId: current.subgroupId,
         });
@@ -125,6 +131,7 @@ const ManageGameScreen = () => {
                 <AdminCacheEditorView
                     userLocation={userLocation}
                     caches={cacheRecords}
+                    claimDistance={claimDistance}
                     onAddCache={handleAddCache}
                     onMoveCache={handleMoveCache}
                 />
diff --git a/src/components/screens/MapScreen.js b/src/components/screens/MapScreen.js
index 5fe5878..0fca762 100644
--- a/src/components/screens/MapScreen.js
+++ b/src/components/screens/MapScreen.js
@@ -40,13 +40,16 @@ const MapScreen = ({navigation}) => {
     const [newCoord, setNewCoord] = useState(null);
     const [newName, setNewName] = useState('');
     const [newClue, setNewClue] = useState('');
-    const [newRadius, setNewRadius] = useState('20');
+
+    // Global claim distance comes from the group's CacheTriggerMeters setting
+    const claimDistance = groupInfo?.CacheTriggerMeters || 20;
 
     const isPlayer = inGame && !isAdmin;
     const {visibleCache, isClaiming, setIsClaiming} = usePlayerGame(
         isPlayer ? userLocation : null,
         isPlayer ? heading : null,
         isPlayer ? cacheRecords : [],
+        claimDistance,
     );
 
     const mapRegion = userLocation
@@ -151,7 +154,6 @@ const MapScreen = ({navigation}) => {
         setNewCoord(fallback);
         setNewName('');
         setNewClue('');
-        setNewRadius('20');
         setIsCreating(true);
     };
 
@@ -161,7 +163,6 @@ const MapScreen = ({navigation}) => {
         setNewCoord(cache.coordinates);
         setNewName(cache.name || '');
         setNewClue(cache.clue || '');
-        setNewRadius(String(cache.radius || 20));
         setIsCreating(true);
     };
 
@@ -180,7 +181,6 @@ const MapScreen = ({navigation}) => {
             name: newName.trim(),
             latitude: newCoord.latitude,
             longitude: newCoord.longitude,
-            radius: parseInt(newRadius) || 20,
             clue: newClue.trim(),
             subgroupId: 1,
         };
@@ -202,6 +202,7 @@ const MapScreen = ({navigation}) => {
             isAdmin,
             cacheRecords: JSON.stringify(cacheRecords),
             heading: heading || 0,
+            claimDistance,
         });
     };
 
@@ -264,7 +265,7 @@ const MapScreen = ({navigation}) => {
                                 <Marker coordinate={cache.coordinates} pinColor="#9ca3af" title={cache.clue}/>
                                 <Circle
                                     center={cache.coordinates}
-                                    radius={cache.radius}
+                                    radius={claimDistance}
                                     fillColor="rgba(156,163,175,0.15)"
                                     strokeColor="rgba(156,163,175,0.6)"
                                 />
@@ -282,7 +283,7 @@ const MapScreen = ({navigation}) => {
                                 />
                                 <Circle
                                     center={newCoord}
-                                    radius={parseInt(newRadius) || 20}
+                                    radius={claimDistance}
                                     fillColor="rgba(37,99,235,0.15)"
                                     strokeColor="rgba(37,99,235,0.85)"
                                 />
@@ -305,8 +306,7 @@ const MapScreen = ({navigation}) => {
                         value={newClue}
                         onChangeText={setNewClue}
                     />
-                    <View style={styles.coordRow}>
-                        <View style={styles.coordField}>
+                    <View style={styles.coordRow}>                        <View style={styles.coordField}>
                             <Text style={styles.coordLabel}>Latitude</Text>
                             <TextInput
                                 style={styles.formInput}
@@ -327,14 +327,6 @@ const MapScreen = ({navigation}) => {
                             />
                         </View>
                     </View>
-                    <TextInput
-                        style={styles.formInput}
-                        placeholder="Claim Radius (metres)"
-                        placeholderTextColor="#9ca3af"
-                        value={newRadius}
-                        onChangeText={setNewRadius}
-                        keyboardType="numeric"
-                    />
                     <ButtonTray>
                         <Button
                             label={editingCacheId ? 'Update Cache' : 'Save Cache'}
@@ -371,7 +363,7 @@ const MapScreen = ({navigation}) => {
                                 <Marker coordinate={cache.coordinates} title={cache.name || cache.clue}/>
                                 <Circle
                                     center={cache.coordinates}
-                                    radius={cache.radius}
+                                    radius={claimDistance}
                                     fillColor="rgba(59,130,246,0.15)"
                                     strokeColor="rgba(59,130,246,0.85)"
                                 />
@@ -450,6 +442,7 @@ const MapScreen = ({navigation}) => {
                     userLocation={userLocation}
                     visibleCache={visibleCache}
                     heading={heading}
+                    claimDistance={claimDistance}
                 />
                 <Pressable style={styles.expandButton} onPress={handleExpandMap}>
                     <Text style={styles.expandIcon}>⛶</Text>
diff --git a/src/hooks/usePlayerGame.js b/src/hooks/usePlayerGame.js
index a2140cc..99e6dcc 100644
--- a/src/hooks/usePlayerGame.js
+++ b/src/hooks/usePlayerGame.js
@@ -1,7 +1,7 @@
 import {useEffect, useState} from 'react';
-import {isLookingAtCache, isWithinRadius} from '../utils/geoMath';
+import {isInClaimCone} from '../utils/geoMath';
 
-const usePlayerGame = (playerLocation, playerHeading, activeCaches) => {
+const usePlayerGame = (playerLocation, playerHeading, activeCaches, claimDistance) => {
 //   State ----------------------
 
     const [visibleCache, setVisibleCache] = useState(null);
@@ -16,19 +16,15 @@ const usePlayerGame = (playerLocation, playerHeading, activeCaches) => {
             return;
         }
 
-        const nearbyCache = (activeCaches || []).find((cache) =>
-            isWithinRadius(playerLocation, cache.coordinates, cache.radius));
+        // Find the first cache that falls inside the invisible claim cone
+        // (same FOV angle as the visible cone, but radius = admin-set claimDistance)
+        const cacheInCone = (activeCaches || []).find((cache) =>
+            isInClaimCone(playerHeading, playerLocation, cache.coordinates, claimDistance)
+        );
 
-        if (!nearbyCache) {
-            setVisibleCache(null);
-            setIsClaiming(false);
-            return;
-        }
-
-        const isTargeted = isLookingAtCache(playerHeading, playerLocation, nearbyCache.coordinates);
-        setVisibleCache(nearbyCache);
-        setIsClaiming(isTargeted);
-    }, [playerLocation, playerHeading, activeCaches]);
+        setVisibleCache(cacheInCone || null);
+        setIsClaiming(Boolean(cacheInCone));
+    }, [playerLocation, playerHeading, activeCaches, claimDistance]);
 
 //   Return ---------------------
 
diff --git a/src/utils/geoMath.js b/src/utils/geoMath.js
index f47db56..38e884a 100644
--- a/src/utils/geoMath.js
+++ b/src/utils/geoMath.js
@@ -1,49 +1,62 @@
 import * as geolib from 'geolib';
 
 // --- FOV Configuration ---
-const FOV_DISTANCE = 30;   // metres — radius of arc + length of straight edges
-const FOV_ANGLE = 60;      // degrees — total field of view (halved for each side)
+const FOV_SIZE = 50;            // metres — radius of the visible FOV cone drawn on screen
+const FOV_ANGLE = 60;           // degrees — total field of view (halved for each side)
+const CACHE_CLAIM_TIMER = 5;    // seconds — how long the player must hold a cache in the claim cone to claim it
 
 // Convert raw Magnetometer {x, y} reading to a 0-360° heading (0° = north)
 const toHeading = ({x, y}) => {
-  const angle = Math.atan2(y, x) * (180 / Math.PI);
-  const heading = 90 - angle;
-  return heading < 0 ? heading + 360 : heading % 360;
+    const angle = Math.atan2(y, x) * (180 / Math.PI);
+    const heading = 90 - angle;
+    return heading < 0 ? heading + 360 : heading % 360;
 };
 
 // Build a pie-shaped FOV sector as polygon coordinates
-const getFovCone = (location, headingDeg, radiusMeters = FOV_DISTANCE, halfAngle = FOV_ANGLE / 2, arcSegments = 20) => {
-  const origin = {latitude: location.latitude, longitude: location.longitude};
-  const startBearing = headingDeg - halfAngle;
-  const endBearing = headingDeg + halfAngle;
-  const step = (endBearing - startBearing) / arcSegments;
+// radiusMeters defaults to FOV_SIZE (the visible cone) — pass a different value to build the invisible claim cone
+const getFovCone = (location, headingDeg, radiusMeters = FOV_SIZE, halfAngle = FOV_ANGLE / 2, arcSegments = 20) => {
+    const origin = {latitude: location.latitude, longitude: location.longitude};
+    const startBearing = headingDeg - halfAngle;
+    const endBearing = headingDeg + halfAngle;
+    const step = (endBearing - startBearing) / arcSegments;
 
-  // Tip of the sector
-  const points = [location];
+    // Tip of the sector
+    const points = [location];
 
-  // Arc points at radiusMeters distance from origin
-  for (let i = 0; i <= arcSegments; i++) {
-    const bearing = startBearing + step * i;
-    const dest = geolib.computeDestinationPoint(origin, radiusMeters, bearing);
-    points.push({latitude: dest.latitude, longitude: dest.longitude});
-  }
+    // Arc points at radiusMeters distance from origin
+    for (let i = 0; i <= arcSegments; i++) {
+        const bearing = startBearing + step * i;
+        const dest = geolib.computeDestinationPoint(origin, radiusMeters, bearing);
+        points.push({latitude: dest.latitude, longitude: dest.longitude});
+    }
 
-  return points;
+    return points;
 };
 
 const isWithinRadius = (playerCoords, cacheCoords, radius) => {
-  const distance = geolib.getDistance(playerCoords, cacheCoords);
-  return distance <= radius;
+    const distance = geolib.getDistance(playerCoords, cacheCoords);
+    return distance <= radius;
 };
 
-const isLookingAtCache = (playerHeading, playerCoords, cacheCoords, tolerance = 20) => {
-  if (playerHeading === null || playerHeading === undefined) {
-    return false;
-  }
-  const bearingToCache = geolib.getRhumbLineBearing(playerCoords, cacheCoords);
-  const diff = Math.abs(bearingToCache - playerHeading);
-  return diff <= tolerance || diff >= 360 - tolerance;
+const isLookingAtCache = (playerHeading, playerCoords, cacheCoords, tolerance = FOV_ANGLE / 2) => {
+    if (playerHeading === null || playerHeading === undefined) {
+        return false;
+    }
+    const bearingToCache = geolib.getRhumbLineBearing(playerCoords, cacheCoords);
+    const diff = Math.abs(bearingToCache - playerHeading);
+    return diff <= tolerance || diff >= 360 - tolerance;
 };
 
-export { toHeading, getFovCone, isWithinRadius, isLookingAtCache };
+// Checks whether a cache falls within the invisible claim sector
+// The claim sector uses the same FOV_ANGLE as the visible cone but extends to the
+// admin-defined claimDistance rather than the visible FOV_SIZE.
+// If the cache sits inside this sector the claiming countdown is triggered.
+const isInClaimCone = (playerHeading, playerCoords, cacheCoords, claimDistance) => {
+    if (playerHeading === null || playerHeading === undefined) return false;
+    // Cache must be within the admin-configured claim distance
+    if (!isWithinRadius(playerCoords, cacheCoords, claimDistance)) return false;
+    // Cache must also fall within the same angular width as the visible cone
+    return isLookingAtCache(playerHeading, playerCoords, cacheCoords);
+};
 
+export { toHeading, getFovCone, isWithinRadius, isLookingAtCache, isInClaimCone, FOV_ANGLE, FOV_SIZE, CACHE_CLAIM_TIMER };