diff --git a/web/kyushu_compare.html b/web/kyushu_compare.html
index a7951f4..6f2d269 100644
--- a/web/kyushu_compare.html
+++ b/web/kyushu_compare.html
@@ -301,6 +301,31 @@ function runtimeHazardSymbol(props){
   if([4,5].includes(watlev))return "OBSTRN03";
   return "OBSTRN01";
 }
+function runtimeHazardDepthText(props){
+  const csp=String((props && props.s52_runtime_csp) || "");
+  const canonical=String((props && props.canonical_object_type) || "");
+  const watlev=runtimeNumber(props,"s52_watlev_code",-9);
+  const hasVal=props && props.least_depth_m!==undefined && props.least_depth_m!==null && props.least_depth_m!=="";
+  if(!hasVal)return "";
+  const valsou=runtimeNumber(props,"least_depth_m",null);
+  if(valsou===null || runtimeHazardIsolated(props))return "";
+
+  let sounding=false;
+  if(csp==="WRECKS02"){
+    sounding=true;
+  }else if(csp==="OBSTRN04"){
+    if(canonical==="underwater_rock"){
+      sounding=!(valsou<=20 && [4,5].includes(watlev));
+    }else{
+      sounding=![1,2].includes(watlev);
+    }
+  }
+  if(!sounding)return "";
+
+  const rounded=Math.round(valsou*10)/10;
+  return Number.isInteger(rounded) ? String(rounded) : rounded.toFixed(1);
+}
+
 function refreshRuntimeHazards(){
   if(!debugRuntimePreview.checked || !leftMap.getSource("cm95") || !leftMap.isSourceLoaded("cm95"))return;
   const source=leftMap.getSource(RUNTIME_HAZARD_SOURCE_ID);
@@ -327,6 +352,8 @@ function refreshRuntimeHazards(){
         properties:{
           runtime_symbol:symbol,
           runtime_csp:csp,
+          runtime_depth_text:runtimeHazardDepthText(props),
+          runtime_depth_m:props.least_depth_m==null?"":String(props.least_depth_m),
           source_feature_id:feature.id==null?"":String(feature.id)
         }
       });
@@ -347,7 +374,17 @@ function addRuntimeHazardLayer(map){
       "icon-image":["get","runtime_symbol"],
       "icon-size":1,
       "icon-allow-overlap":true,
-      "icon-ignore-placement":true
+      "icon-ignore-placement":true,
+      "text-field":["get","runtime_depth_text"],
+      "text-size":11,
+      "text-anchor":"center",
+      "text-allow-overlap":true,
+      "text-ignore-placement":true
+    },
+    paint:{
+      "text-color":"#30383b",
+      "text-halo-color":"rgba(216,237,245,0.7)",
+      "text-halo-width":0.35
     }
   });
   setTimeout(refreshRuntimeHazards,0);