diff --git a/viewer/index.html b/viewer/index.html
index cba252b..db41fe7 100644
--- a/viewer/index.html
+++ b/viewer/index.html
@@ -756,8 +756,10 @@ async function loadDate(date) {
     const knownMissions = dateEntry && dateEntry.missions && dateEntry.missions.length
       ? dateEntry.missions
       : null;
+    // BUG3b FIX: API data-dates uses #71-golrest but /api/missions uses _71-golrest — normalize for compare
+    const normalize = id => (id || '').replace(/^[#_]/, '').toLowerCase();
     const missionsToFetch = knownMissions
-      ? missions.filter(m => knownMissions.includes(m.id) || knownMissions.some(km => m.id.includes(km) || km.includes(m.id)))
+      ? missions.filter(m => knownMissions.some(km => normalize(m.id) === normalize(km)))
       : missions;
 
     const fetches = (missionsToFetch.length > 0 ? missionsToFetch : missions).map(async mission => {
@@ -1228,6 +1230,7 @@ async function loadSortieData(sortieId) {
       const usvData = await usvResp.json();
       renderUSV(usvData.signals);
       showNoDataOverlay(false);  // BUG2 FIX: hide overlay when data loaded
+      switchTab('usv');  // BUG1c FIX: auto-switch to USV tab where charts are rendered
     }
     prog.textContent = 'Chargement AUV…';
     await loadAuvTabs(sortieId);