diff --git a/test/aprsme_web/live/info_live/show_full_render_test.exs b/test/aprsme_web/live/info_live/show_full_render_test.exs
index 5c59ce7..00897b8 100644
--- a/test/aprsme_web/live/info_live/show_full_render_test.exs
+++ b/test/aprsme_web/live/info_live/show_full_render_test.exs
@@ -146,6 +146,91 @@ defmodule AprsmeWeb.InfoLive.ShowFullRenderTest do
       assert html =~ "NOPATH"
     end
 
+    test "posts a broadcast that triggers a position change", %{conn: conn} do
+      _packet =
+        packet_fixture(%{
+          sender: "MOVED",
+          base_callsign: "MOVED",
+          ssid: "0",
+          received_at: DateTime.utc_now(),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_position: true,
+          path: ""
+        })
+
+      {:ok, lv, _html} = live(conn, ~p"/info/MOVED", on_error: :warn)
+
+      # Insert a newer packet with a significantly different position.
+      _new_packet =
+        packet_fixture(%{
+          sender: "MOVED",
+          base_callsign: "MOVED",
+          ssid: "0",
+          received_at: DateTime.add(DateTime.utc_now(), 1, :second),
+          lat: Decimal.new("34.0"),
+          lon: Decimal.new("-95.0"),
+          has_position: true,
+          path: ""
+        })
+
+      send(lv.pid, {:postgres_packet, %{sender: "MOVED"}})
+      Process.sleep(30)
+      assert render(lv) =~ "MOVED"
+    end
+
+    test "posts a broadcast without position change keeps neighbors intact", %{conn: conn} do
+      _packet =
+        packet_fixture(%{
+          sender: "STILL",
+          base_callsign: "STILL",
+          ssid: "0",
+          received_at: DateTime.utc_now(),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_position: true,
+          path: ""
+        })
+
+      {:ok, lv, _html} = live(conn, ~p"/info/STILL", on_error: :warn)
+
+      # Another packet with the SAME position — position_changed? returns false.
+      _new_packet =
+        packet_fixture(%{
+          sender: "STILL",
+          base_callsign: "STILL",
+          ssid: "0",
+          received_at: DateTime.add(DateTime.utc_now(), 1, :second),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_position: true,
+          path: ""
+        })
+
+      send(lv.pid, {:postgres_packet, %{sender: "STILL"}})
+      Process.sleep(30)
+      assert render(lv) =~ "STILL"
+    end
+
+    test "ignores unknown messages without crashing", %{conn: conn} do
+      _packet =
+        packet_fixture(%{
+          sender: "UNK",
+          base_callsign: "UNK",
+          ssid: "0",
+          received_at: DateTime.utc_now(),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_position: true
+        })
+
+      {:ok, lv, _html} = live(conn, ~p"/info/UNK", on_error: :warn)
+
+      send(lv.pid, :some_arbitrary_message)
+      Process.sleep(20)
+      assert Process.alive?(lv.pid)
+    end
+
     test "posts a postgres_packet broadcast to InfoLive.Show without crashing", %{conn: conn} do
       _packet =
         packet_fixture(%{