diff --git a/assets/js/map.ts b/assets/js/map.ts
index 09d2593..ec3386c 100644
--- a/assets/js/map.ts
+++ b/assets/js/map.ts
@@ -1520,6 +1520,12 @@ let MapAPRSMap = {
 
     // Handle clear_all_markers event
     self.handleEvent("clear_all_markers", () => {
+      // Clear trail line if present
+      if (self.trailLine) {
+        self.map?.removeLayer(self.trailLine);
+        self.trailLine = undefined;
+      }
+
       // Modified to preserve historical trails - only removes non-historical markers
       self.clearAllMarkers();
 
@@ -1537,6 +1543,12 @@ let MapAPRSMap = {
           return;
         }
 
+        // Clear trail line if present
+        if (self.trailLine) {
+          self.map.removeLayer(self.trailLine);
+          self.trailLine = undefined;
+        }
+
         if (!L.heatLayer) {
           console.error("Leaflet.heat plugin not loaded!");
           return;
@@ -1595,6 +1607,12 @@ let MapAPRSMap = {
           return;
         }
 
+        // Clear trail line if present
+        if (self.trailLine) {
+          self.map.removeLayer(self.trailLine);
+          self.trailLine = undefined;
+        }
+
         // Hide heat layer and show marker layer
         if (self.heatLayer && self.map.hasLayer(self.heatLayer)) {
           self.map.removeLayer(self.heatLayer);
@@ -1606,6 +1624,69 @@ let MapAPRSMap = {
         console.error("Error in show_markers handler:", error);
       }
     });
+
+    // Handle trail line display for tracked callsigns at low zoom
+    self.handleEvent("show_trail_line", (payload: BaseEventPayload) => {
+      const data = payload as { callsign: string; points: Array<{ lat: number; lng: number; timestamp: string }> };
+
+      if (!self.map) {
+        console.warn("Map not initialized, cannot show trail line");
+        return;
+      }
+
+      // Clear existing trail line if present
+      if (self.trailLine) {
+        self.map.removeLayer(self.trailLine);
+        self.trailLine = undefined;
+      }
+
+      // Clear heat map if present (switching from heat map to trail line)
+      if (self.heatLayer) {
+        self.map.removeLayer(self.heatLayer);
+        self.heatLayer = undefined;
+      }
+
+      // If we have less than 2 points, don't draw a line
+      if (data.points.length < 2) {
+        console.debug(`Not enough points for trail line: ${data.points.length}`);
+        return;
+      }
+
+      // Extract coordinates for polyline
+      const latlngs = data.points.map(point => [point.lat, point.lng] as [number, number]);
+
+      // Access Leaflet from window
+      const L = (window as any).L;
+
+      // Create polyline
+      self.trailLine = L.polyline(latlngs, {
+        color: '#3B82F6',      // blue-500
+        weight: 3,
+        opacity: 0.8,
+        lineCap: 'round',
+        lineJoin: 'round',
+        interactive: true
+      });
+
+      // Add to map
+      self.trailLine.addTo(self.map);
+
+      console.debug(`Trail line added for ${data.callsign} with ${data.points.length} points`);
+    });
+
+    // Handle clearing trail line
+    self.handleEvent("clear_trail_line", (_payload: BaseEventPayload) => {
+      if (!self.map) {
+        return;
+      }
+
+      // Remove trail line if present
+      if (self.trailLine) {
+        self.map.removeLayer(self.trailLine);
+        self.trailLine = undefined;
+        console.debug("Trail line cleared");
+      }
+    });
   },
 
   sendBoundsToServer() {
diff --git a/assets/js/types/map.d.ts b/assets/js/types/map.d.ts
index 7f2c48f..77844ca 100644
--- a/assets/js/types/map.d.ts
+++ b/assets/js/types/map.d.ts
@@ -34,6 +34,7 @@ export interface LiveViewHookContext {
   zoomEndHandler?: () => void;
   rfPathLines?: Array<Polyline | Marker>; // Array of Leaflet polylines and markers for RF path visualization
   trailLayer?: LayerGroup;
+  trailLine?: Polyline; // Polyline for callsign trail display at low zoom
   markerClusterGroup?: MarkerClusterGroup;
   cleanupTimeouts?: ReturnType<typeof setTimeout>[];
   pendingMarkers?: MarkerData[];
diff --git a/lib/aprsme_web/live/map_live/display_manager.ex b/lib/aprsme_web/live/map_live/display_manager.ex
index 482a8b5..d150333 100644
--- a/lib/aprsme_web/live/map_live/display_manager.ex
+++ b/lib/aprsme_web/live/map_live/display_manager.ex
@@ -14,14 +14,22 @@ defmodule AprsmeWeb.MapLive.DisplayManager do
 
   @doc """
   Handle zoom threshold crossing between heat map and marker modes.
+  When tracking a callsign at low zoom, show trail line instead of heat map.
   """
   @spec handle_zoom_threshold_crossing(Socket.t(), integer()) :: Socket.t()
   def handle_zoom_threshold_crossing(socket, zoom) do
+    tracked_callsign = socket.assigns.tracked_callsign || ""
+
     if zoom <= @heat_map_max_zoom do
-      # Switching to heat map
-      socket
-      |> LiveView.push_event("clear_all_markers", %{})
-      |> send_heat_map_for_current_bounds()
+      # Switching to low zoom mode
+      socket = LiveView.push_event(socket, "clear_all_markers", %{})
+
+      # If tracking a callsign, show trail line; otherwise show heat map
+      if tracked_callsign == "" do
+        send_heat_map_for_current_bounds(socket)
+      else
+        send_trail_line_for_tracked_callsign(socket)
+      end
     else
       # Switching to markers
       trigger_marker_display(socket)
@@ -74,6 +82,56 @@ defmodule AprsmeWeb.MapLive.DisplayManager do
     end
   end
 
+  @doc """
+  Send trail line data for tracked callsign.
+  Connects all position points chronologically, regardless of distance.
+  """
+  @spec send_trail_line_for_tracked_callsign(Socket.t()) :: Socket.t()
+  def send_trail_line_for_tracked_callsign(socket) do
+    callsign = socket.assigns.tracked_callsign
+    threshold = socket.assigns.packet_age_threshold
+
+    packets =
+      socket.assigns.visible_packets
+      |> Map.values()
+      |> Enum.filter(fn packet ->
+        sender = Map.get(packet, :sender) || Map.get(packet, "sender")
+        received_at = Map.get(packet, :received_at) || Map.get(packet, "received_at")
+
+        String.upcase(sender) == String.upcase(callsign) &&
+          DateTime.compare(received_at, threshold) != :lt
+      end)
+      |> Enum.sort_by(
+        fn packet ->
+          received_at = Map.get(packet, :received_at) || Map.get(packet, "received_at")
+          DateTime.to_unix(received_at, :microsecond)
+        end,
+        :asc
+      )
+
+    if Enum.empty?(packets) do
+      socket
+    else
+      points =
+        Enum.map(packets, fn packet ->
+          lat = Map.get(packet, :lat) || Map.get(packet, "lat")
+          lon = Map.get(packet, :lon) || Map.get(packet, "lon")
+          received_at = Map.get(packet, :received_at) || Map.get(packet, "received_at")
+
+          %{
+            lat: Aprsme.EncodingUtils.to_float(lat) || 0.0,
+            lng: Aprsme.EncodingUtils.to_float(lon) || 0.0,
+            timestamp: DateTime.to_iso8601(received_at)
+          }
+        end)
+
+      LiveView.push_event(socket, "show_trail_line", %{
+        callsign: callsign,
+        points: points
+      })
+    end
+  end
+
   @doc """
   Send heat map data for filtered packets.
   """
diff --git a/lib/aprsme_web/live/map_live/index.ex b/lib/aprsme_web/live/map_live/index.ex
index dc714d6..2a27019 100644
--- a/lib/aprsme_web/live/map_live/index.ex
+++ b/lib/aprsme_web/live/map_live/index.ex
@@ -510,6 +510,7 @@ defmodule AprsmeWeb.MapLive.Index do
     socket =
       socket
       |> assign(tracked_callsign: "", overlay_callsign: "", other_ssids: [])
+      |> push_event("clear_trail_line", %{})
       |> update_url_with_current_state()
 
     {:noreply, socket}
@@ -534,6 +535,14 @@ defmodule AprsmeWeb.MapLive.Index do
     # Trigger cleanup to remove packets that are now outside the new duration
     send(self(), :cleanup_old_packets)
 
+    # If tracking a callsign at low zoom, refresh the trail line with new duration
+    socket =
+      if socket.assigns.tracked_callsign != "" and socket.assigns.map_zoom <= 8 do
+        DisplayManager.send_trail_line_for_tracked_callsign(socket)
+      else
+        socket
+      end
+
     {:noreply, socket}
   end
 
@@ -1089,8 +1098,15 @@ defmodule AprsmeWeb.MapLive.Index do
   defp update_display_for_batch(socket, []), do: socket
 
   defp update_display_for_batch(socket, marker_data_list) do
+    tracked_callsign = socket.assigns.tracked_callsign || ""
+
     if socket.assigns.map_zoom <= 8 do
-      DisplayManager.send_heat_map_for_current_bounds(socket)
+      # If tracking a callsign, send trail line instead of heat map
+      if tracked_callsign == "" do
+        DisplayManager.send_heat_map_for_current_bounds(socket)
+      else
+        DisplayManager.send_trail_line_for_tracked_callsign(socket)
+      end
     else
       send_marker_batch(socket, marker_data_list)
     end
@@ -1987,6 +2003,15 @@ defmodule AprsmeWeb.MapLive.Index do
 
     socket = HistoricalLoader.start_progressive_historical_loading(socket)
 
+    # If tracking a callsign and at low zoom, send trail line instead of letting
+    # historical loader send heat map
+    socket =
+      if socket.assigns.tracked_callsign != "" and socket.assigns.map_zoom <= 8 do
+        DisplayManager.send_trail_line_for_tracked_callsign(socket)
+      else
+        socket
+      end
+
     # Mark initial historical as completed if this was the initial load
     if is_initial_load do
       assign(socket, initial_historical_completed: true)
diff --git a/test/aprsme_web/live/map_live/display_manager_test.exs b/test/aprsme_web/live/map_live/display_manager_test.exs
new file mode 100644
index 0000000..90ba108
--- /dev/null
+++ b/test/aprsme_web/live/map_live/display_manager_test.exs
@@ -0,0 +1,231 @@
+defmodule AprsmeWeb.MapLive.DisplayManagerTest do
+  use Aprsme.DataCase, async: true
+
+  alias AprsmeWeb.MapLive.DisplayManager
+
+  setup do
+    # Create a basic socket mock for testing
+    socket = %Phoenix.LiveView.Socket{
+      assigns: %{
+        visible_packets: %{},
+        tracked_callsign: nil,
+        packet_age_threshold: nil,
+        map_bounds: nil,
+        map_zoom: 10,
+        historical_packets: %{}
+      },
+      private: %{live_temp: %{}}
+    }
+
+    {:ok, socket: socket}
+  end
+
+  # Helper function to assert push events
+  defp assert_push_event(socket, event_name, expected_data) do
+    push_events = get_in(socket.private, [:live_temp, :push_events]) || []
+
+    matching_event = Enum.find(push_events, fn [name, _data] -> name == event_name end)
+
+    assert matching_event != nil, "Expected to find event '#{event_name}' in push_events"
+
+    [_name, data] = matching_event
+
+    # For partial matching, check if all expected keys are present
+    Enum.each(expected_data, fn {key, value} ->
+      assert Map.get(data, key) == value,
+             "Expected #{key} to be #{inspect(value)}, got #{inspect(Map.get(data, key))}"
+    end)
+
+    socket
+  end
+
+  describe "handle_zoom_threshold_crossing/2" do
+    test "shows trail line for tracked callsign at low zoom", %{socket: socket} do
+      packet1 = %{
+        id: "1",
+        sender: "W5ISP-9",
+        lat: 30.123,
+        lon: -97.456,
+        received_at: ~U[2024-01-01 10:00:00Z]
+      }
+
+      visible_packets = %{"W5ISP-9:1" => packet1}
+
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: visible_packets,
+            tracked_callsign: "W5ISP-9",
+            packet_age_threshold: ~U[2024-01-01 09:00:00Z],
+            map_zoom: 8
+        })
+
+      # Zoom from 9 to 8 (crossing threshold) - socket already has new zoom
+      result_socket = DisplayManager.handle_zoom_threshold_crossing(socket, 8)
+
+      # Should clear markers and show trail line
+      assert_push_event(result_socket, "clear_all_markers", %{})
+      assert_push_event(result_socket, "show_trail_line", %{callsign: "W5ISP-9"})
+    end
+
+    test "shows heat map when no tracked callsign at low zoom", %{socket: socket} do
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: %{},
+            tracked_callsign: "",
+            historical_packets: %{},
+            map_bounds: %{north: 90, south: -90, east: 180, west: -180},
+            map_zoom: 8
+        })
+
+      # Zoom from 9 to 8 (crossing threshold) - socket already has new zoom
+      result_socket = DisplayManager.handle_zoom_threshold_crossing(socket, 8)
+
+      # Should clear markers and show heat map
+      assert_push_event(result_socket, "clear_all_markers", %{})
+      assert_push_event(result_socket, "show_heat_map", %{heat_points: []})
+    end
+
+    test "shows markers for tracked callsign at high zoom", %{socket: socket} do
+      packet1 = %{
+        id: "1",
+        sender: "W5ISP-9",
+        lat: 30.123,
+        lon: -97.456,
+        received_at: ~U[2024-01-01 10:00:00Z]
+      }
+
+      visible_packets = %{"W5ISP-9:1" => packet1}
+
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: visible_packets,
+            tracked_callsign: "W5ISP-9",
+            packet_age_threshold: ~U[2024-01-01 09:00:00Z],
+            map_zoom: 9
+        })
+
+      # Zoom from 8 to 9 (crossing threshold) - socket already has new zoom
+      result_socket = DisplayManager.handle_zoom_threshold_crossing(socket, 9)
+
+      # Should show markers
+      assert_push_event(result_socket, "show_markers", %{})
+    end
+  end
+
+  describe "send_trail_line_for_tracked_callsign/1" do
+    test "pushes trail line event with sorted points", %{socket: socket} do
+      packet1 = %{
+        id: "1",
+        sender: "W5ISP-9",
+        lat: 30.123,
+        lon: -97.456,
+        received_at: ~U[2024-01-01 10:00:00Z]
+      }
+
+      packet2 = %{
+        id: "2",
+        sender: "W5ISP-9",
+        lat: 30.124,
+        lon: -97.457,
+        received_at: ~U[2024-01-01 10:05:00Z]
+      }
+
+      packet3 = %{
+        id: "3",
+        sender: "W5ISP-9",
+        lat: 30.125,
+        lon: -97.458,
+        received_at: ~U[2024-01-01 10:10:00Z]
+      }
+
+      visible_packets = %{"W5ISP-9:1" => packet1, "W5ISP-9:2" => packet2, "W5ISP-9:3" => packet3}
+
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: visible_packets,
+            tracked_callsign: "W5ISP-9",
+            packet_age_threshold: ~U[2024-01-01 09:00:00Z]
+        })
+
+      result_socket = DisplayManager.send_trail_line_for_tracked_callsign(socket)
+
+      push_events = get_in(result_socket.private, [:live_temp, :push_events]) || []
+      assert length(push_events) == 1
+
+      [[event_name, event_data]] = push_events
+      assert event_name == "show_trail_line"
+
+      assert event_data == %{
+               callsign: "W5ISP-9",
+               points: [
+                 %{lat: 30.123, lng: -97.456, timestamp: "2024-01-01T10:00:00Z"},
+                 %{lat: 30.124, lng: -97.457, timestamp: "2024-01-01T10:05:00Z"},
+                 %{lat: 30.125, lng: -97.458, timestamp: "2024-01-01T10:10:00Z"}
+               ]
+             }
+    end
+
+    test "filters by packet age threshold", %{socket: socket} do
+      packet1 = %{
+        id: "1",
+        sender: "W5ISP-9",
+        lat: 30.123,
+        lon: -97.456,
+        received_at: ~U[2024-01-01 09:00:00Z]
+      }
+
+      # Too old
+      packet2 = %{
+        id: "2",
+        sender: "W5ISP-9",
+        lat: 30.124,
+        lon: -97.457,
+        received_at: ~U[2024-01-01 10:05:00Z]
+      }
+
+      # Within threshold
+
+      visible_packets = %{"W5ISP-9:1" => packet1, "W5ISP-9:2" => packet2}
+
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: visible_packets,
+            tracked_callsign: "W5ISP-9",
+            packet_age_threshold: ~U[2024-01-01 10:00:00Z]
+        })
+
+      result_socket = DisplayManager.send_trail_line_for_tracked_callsign(socket)
+
+      push_events = get_in(result_socket.private, [:live_temp, :push_events]) || []
+      assert length(push_events) == 1
+
+      [[event_name, event_data]] = push_events
+      assert event_name == "show_trail_line"
+
+      assert event_data == %{
+               callsign: "W5ISP-9",
+               points: [%{lat: 30.124, lng: -97.457, timestamp: "2024-01-01T10:05:00Z"}]
+             }
+    end
+
+    test "returns socket unchanged when no packets", %{socket: socket} do
+      socket =
+        Map.put(socket, :assigns, %{
+          socket.assigns
+          | visible_packets: %{},
+            tracked_callsign: "W5ISP-9",
+            packet_age_threshold: ~U[2024-01-01 10:00:00Z]
+        })
+
+      result_socket = DisplayManager.send_trail_line_for_tracked_callsign(socket)
+
+      push_events = get_in(result_socket.private, [:live_temp, :push_events]) || []
+      assert push_events == []
+    end
+  end
+end