diff --git a/src/menu/physicalPosition.js b/src/menu/physicalPosition.js
index 191dd79..e22cfb1 100644
--- a/src/menu/physicalPosition.js
+++ b/src/menu/physicalPosition.js
@@ -11,7 +11,25 @@ class PhysicalPositionMenu {
             { value: 'downstream',   label: '→ Downstream' , icon: '→' }
           ]
         }
-      ]
+      ],
+      // Distance contexts for each position
+      distanceContexts: {
+        upstream: {
+          description: 'Distance from parent inlet',
+          placeholder: 'e.g., 2.5 (meters before parent)',
+          helpText: 'How far upstream from the parent equipment'
+        },
+        downstream: {
+          description: 'Distance from parent outlet', 
+          placeholder: 'e.g., 3.0 (meters after parent)',
+          helpText: 'How far downstream from the parent equipment'
+        },
+        atEquipment: {
+          description: 'Distance from parent start',
+          placeholder: 'e.g., 1.2 (meters from start)', 
+          helpText: 'Position within the parent equipment boundaries'
+        }
+      }
     };
   }
 
@@ -26,6 +44,24 @@ class PhysicalPositionMenu {
           <!-- optgroups will be injected -->
         </select>
       </div>
+
+      <!-- Distance section -->
+      <div class="form-row">
+        <label>&nbsp;</label>
+        <input type="checkbox" id="node-input-hasDistance" style="display:inline-block; width:auto; margin-right:5px;">
+        <label for="node-input-hasDistance" style="width:auto;">Specify 1D Distance</label>
+      </div>
+      
+      <div id="distance-section" class="form-row" style="display:none;">
+        <label for="node-input-distance"><i class="fa fa-ruler"></i>Distance</label>
+        <div style="display:flex; align-items:center; width:70%;">
+          <input type="number" id="node-input-distance" step="0.1" min="0" style="width:60%;" placeholder="0.0">
+          <span style="margin-left:5px; margin-right:5px;">meters</span>
+        </div>
+        <div id="distance-help" class="form-tips" style="margin-left:105px; font-size:11px; color:#666;">
+          Select a position to see distance context
+        </div>
+      </div>
     <hr />
     `;
   }
@@ -52,22 +88,40 @@ class PhysicalPositionMenu {
       window.EVOLV.nodes.${nodeName}.positionMenu.loadData = function(node) {
         const data = window.EVOLV.nodes.${nodeName}.menuData.position;
         const sel  = document.getElementById('node-input-positionVsParent');
-        if (!sel) return;
-        sel.innerHTML = '';
-        (data.positionGroups||[]).forEach(grp => {
-          const optg = document.createElement('optgroup');
-          optg.label = grp.group;
-          grp.options.forEach(o=>{
-            const opt = document.createElement('option');
-            opt.value = o.value;
-            opt.textContent = o.label;
-            opt.setAttribute('data-icon', o.icon);
-            optg.appendChild(opt);
+        const hasDistanceCheck = document.getElementById('node-input-hasDistance');
+        const distanceInput = document.getElementById('node-input-distance');
+        const distanceSection = document.getElementById('distance-section');
+        
+        //Load position options
+        if (sel) {
+          sel.innerHTML = '';
+          (data.positionGroups||[]).forEach(grp => {
+            const optg = document.createElement('optgroup');
+            optg.label = grp.group;
+            grp.options.forEach(o=>{
+              const opt = document.createElement('option');
+              opt.value = o.value;
+              opt.textContent = o.label;
+              opt.setAttribute('data-icon', o.icon);
+              optg.appendChild(opt);
+            });
+            sel.appendChild(optg);
           });
-          sel.appendChild(optg);
-        });
-        // default to “atEquipment” if not set
-        sel.value = node.positionVsParent || 'atEquipment';
+          sel.value = node.positionVsParent || 'atEquipment';
+        }
+        
+        //Load distance values
+        if (hasDistanceCheck) {
+          hasDistanceCheck.checked = node.hasDistance || false;
+          distanceSection.style.display = hasDistanceCheck.checked ? 'block' : 'none';
+        }
+        
+        if (distanceInput) {
+          distanceInput.value = node.distance || '';
+        }
+        
+        // Update distance context for current position
+        this.updateDistanceContext(node.positionVsParent || 'atEquipment', data.distanceContexts);
       };
     `;
   }
@@ -77,24 +131,86 @@ class PhysicalPositionMenu {
     return `
       // PhysicalPosition events for ${nodeName}
       window.EVOLV.nodes.${nodeName}.positionMenu.wireEvents = function(node) {
-        // no dynamic behavior
+        const positionSel = document.getElementById('node-input-positionVsParent');
+        const hasDistanceCheck = document.getElementById('node-input-hasDistance');
+        const distanceSection = document.getElementById('distance-section');
+        const data = window.EVOLV.nodes.${nodeName}.menuData.position;
+        
+        // Toggle distance section visibility
+        if (hasDistanceCheck && distanceSection) {
+          hasDistanceCheck.addEventListener('change', function() {
+            distanceSection.style.display = this.checked ? 'block' : 'none';
+            
+            // Clear distance if unchecked
+            if (!this.checked) {
+              const distanceInput = document.getElementById('node-input-distance');
+              if (distanceInput) {
+                distanceInput.value = '';
+              }
+            }
+          });
+        }
+        
+        // Update distance context when position changes
+        if (positionSel) {
+          positionSel.addEventListener('change', function() {
+            const position = this.value;
+            window.EVOLV.nodes.${nodeName}.positionMenu.updateDistanceContext(position, data.distanceContexts);
+          });
+        }
+      };
+      
+      // Helper function to update distance context
+      window.EVOLV.nodes.${nodeName}.positionMenu.updateDistanceContext = function(position, contexts) {
+        const distanceInput = document.getElementById('node-input-distance');
+        const distanceHelp = document.getElementById('distance-help');
+        
+        const context = contexts && contexts[position];
+        
+        if (context && distanceInput && distanceHelp) {
+          distanceInput.placeholder = context.placeholder || '0.0';
+          distanceHelp.textContent = context.helpText || 'Enter distance in meters';
+        }
       };
     `;
   }
 
   // 6) Save-logic injector
-  getSaveInjectionCode(nodeName) {
-    return `
-      // PhysicalPosition Save injection for ${nodeName}
-      window.EVOLV.nodes.${nodeName}.positionMenu.saveEditor = function(node) {
-        const sel = document.getElementById('node-input-positionVsParent');
-        node.positionVsParent = sel? sel.value : 'atEquipment';
-        node.positionLabel = sel? sel.options[sel.selectedIndex].textContent : 'At Equipment';
-        node.positionIcon = sel? sel.options[sel.selectedIndex].getAttribute('data-icon') : 'fa fa-cog';
-        return true;
-      };
-    `;
-  }
+getSaveInjectionCode(nodeName) {
+  return `
+    // PhysicalPosition Save injection for ${nodeName}
+    window.EVOLV.nodes.${nodeName}.positionMenu.saveEditor = function(node) {
+      const sel = document.getElementById('node-input-positionVsParent');
+      const hasDistanceCheck = document.getElementById('node-input-hasDistance');
+      const distanceInput = document.getElementById('node-input-distance');
+      
+      // Save existing position data
+      node.positionVsParent = sel ? sel.value : 'atEquipment';
+      node.positionLabel = sel ? sel.options[sel.selectedIndex].textContent : 'At Equipment';
+      node.positionIcon = sel ? sel.options[sel.selectedIndex].getAttribute('data-icon') : 'fa fa-cog';
+      
+      // Save distance data (NEW)
+      node.hasDistance = hasDistanceCheck ? hasDistanceCheck.checked : false;
+      
+      if (node.hasDistance && distanceInput && distanceInput.value) {
+        node.distance = parseFloat(distanceInput.value) || 0;
+        node.distanceUnit = 'm'; // Fixed to meters for now
+        
+        // Generate distance description based on position
+        const contexts = window.EVOLV.nodes.${nodeName}.menuData.position.distanceContexts;
+        const context = contexts && contexts[node.positionVsParent];
+        node.distanceDescription = context ? context.description : 'Distance from parent';
+      } else {
+        // Clear distance data if not specified
+        delete node.distance;
+        delete node.distanceUnit;
+        delete node.distanceDescription;
+      }
+      
+      return true;
+    };
+  `;
+}
 
   // 7) Compose everything into one client bundle
   getClientInitCode(nodeName) {