diff --git a/app/static/index.html b/app/static/index.html
index 4100be3..f5eba23 100644
--- a/app/static/index.html
+++ b/app/static/index.html
@@ -868,6 +868,7 @@
                             </div>
                             <div class="lp-opacity">Opacity <input type="range" id="lp-sentinel-opacity" min="5" max="100" value="80" oninput="setSentinelOpacity(this.value)"><b id="lp-sentinel-val">80%</b></div>
                             <div class="lp-note">Cloud-penetrating C-band. Last 7 days, viewport bbox. Tiles from same-origin TiTiler — not fetched on load.</div>
+                            <div class="lp-note">SAR + AIS: bright radar with no boat icon is a <em>candidate</em>, not a detection.</div>
                         </div>
                         <div class="lp-layer">
                             <div class="lp-row">
diff --git a/tests/test_frontend_reliability.py b/tests/test_frontend_reliability.py
index d734f49..f573bac 100644
--- a/tests/test_frontend_reliability.py
+++ b/tests/test_frontend_reliability.py
@@ -76,3 +76,25 @@ def test_phone_chokepoints_use_select_not_buttons():
     mobile = HTML.split("@media (max-width: 820px)")[1].split("@media (prefers-reduced-motion")[0]
     assert "#chokepoint-select { display: block; }" in mobile
     assert ".chokepoint-btns { display: none; }" in mobile or "#chokepoint-label, .chokepoint-btns { display: none; }" in mobile
+
+
+def test_dark_hull_v1_sar_ais_candidate_note():
+    sar = HTML.split('id="sentinel-1-sar"')[1].split('class="lp-layer"')[0]
+    assert "SAR + AIS:" in sar
+    assert "candidate" in sar
+    assert "not a detection" in sar
+    assert sar.count('class="lp-note"') >= 2
+
+
+def test_hormuz_tap_enables_sar_and_vesselapi_src():
+    apply = HTML.split("function applyChokepoint")[1].split("function currentBBox")[0]
+    assert "p.vesselapi ? 'vesselapi' : ''" in apply
+    assert "vChk.checked = true" in apply
+    assert "vesselsOn = true" in apply
+    assert "p.id === 'hormuz' || p.vesselapi" in apply
+    assert "sChk.checked = true" in apply
+    assert "sentinelOn = true" in apply
+    assert "if (vesselsOn) loadVessels();" in apply
+    assert "if (sentinelOn) loadSentinel1();" in apply
+    load = HTML.split("async function loadVessels")[1].split("async function toggleStorms")[0]
+    assert "&src=${encodeURIComponent(vesselSrcPref)}" in load or "src=${encodeURIComponent(vesselSrcPref)}" in load