diff --git a/test/aprsme/packets_test.exs b/test/aprsme/packets_test.exs
index fb95c57..15ba9b3 100644
--- a/test/aprsme/packets_test.exs
+++ b/test/aprsme/packets_test.exs
@@ -1033,4 +1033,68 @@ defmodule Aprsme.PacketsTest do
       assert is_list(results)
     end
   end
+
+  describe "get_latest_positions_for_callsigns/1" do
+    test "returns a map from callsign to the latest packet" do
+      _old =
+        PacketsFixtures.packet_fixture(%{
+          sender: "POS1",
+          received_at: DateTime.add(DateTime.utc_now(), -7200, :second),
+          lat: 39.0,
+          lon: -98.0,
+          has_position: true
+        })
+
+      _new =
+        PacketsFixtures.packet_fixture(%{
+          sender: "POS1",
+          received_at: DateTime.add(DateTime.utc_now(), -60, :second),
+          lat: 39.5,
+          lon: -98.5,
+          has_position: true
+        })
+
+      _other =
+        PacketsFixtures.packet_fixture(%{
+          sender: "POS2",
+          received_at: DateTime.utc_now(),
+          lat: 40.0,
+          lon: -99.0,
+          has_position: true
+        })
+
+      result = Packets.get_latest_positions_for_callsigns(["POS1", "POS2", "MISSING"])
+      assert is_list(result)
+      callsigns = Enum.map(result, & &1.callsign)
+      assert "POS1" in callsigns or "POS2" in callsigns
+    end
+
+    test "returns an empty list for an empty callsign list" do
+      assert Packets.get_latest_positions_for_callsigns([]) == []
+    end
+  end
+
+  describe "get_latest_packets_for_callsigns/1" do
+    test "returns the latest packet for each callsign" do
+      _ =
+        PacketsFixtures.packet_fixture(%{
+          sender: "LPFC1",
+          received_at: DateTime.add(DateTime.utc_now(), -3600, :second)
+        })
+
+      _ =
+        PacketsFixtures.packet_fixture(%{
+          sender: "LPFC2",
+          received_at: DateTime.utc_now()
+        })
+
+      result = Packets.get_latest_packets_for_callsigns(["LPFC1", "LPFC2", "NOPE"])
+      assert is_list(result) or is_map(result)
+    end
+
+    test "handles an empty list" do
+      result = Packets.get_latest_packets_for_callsigns([])
+      assert result == [] or result == %{}
+    end
+  end
 end