diff --git a/lib/aprs/packet.ex b/lib/aprs/packet.ex
index d15c4c9..9936fd4 100644
--- a/lib/aprs/packet.ex
+++ b/lib/aprs/packet.ex
@@ -134,7 +134,7 @@ defmodule Aprs.Packet do
           data_extended = get_change(changeset, :data_extended)
 
           if data_extended do
-            {data_extended.latitude, data_extended.longitude}
+            {data_extended[:latitude], data_extended[:longitude]}
           else
             {nil, nil}
           end
diff --git a/lib/aprs/packets.ex b/lib/aprs/packets.ex
index a0d652b..1122c16 100644
--- a/lib/aprs/packets.ex
+++ b/lib/aprs/packets.ex
@@ -94,7 +94,7 @@ defmodule Aprs.Packets do
         cond do
           # Standard position format
           is_map(data_extended) and not is_nil(data_extended[:latitude]) and not is_nil(data_extended[:longitude]) ->
-            {to_float(data_extended.latitude), to_float(data_extended.longitude)}
+            {to_float(data_extended[:latitude]), to_float(data_extended[:longitude])}
 
           # MicE packet format with components
           is_map(data_extended) and data_extended.__struct__ == Parser.Types.MicE ->
diff --git a/lib/types/mic_e.ex b/lib/types/mic_e.ex
index 59112c5..643c3dd 100644
--- a/lib/types/mic_e.ex
+++ b/lib/types/mic_e.ex
@@ -31,16 +31,24 @@ defmodule Parser.Types.MicE do
   """
   def fetch(mic_e, :latitude) do
     # Calculate decimal latitude from components
-    lat = mic_e.lat_degrees + mic_e.lat_minutes / 60.0
-    lat = if mic_e.lat_direction == :south, do: -lat, else: lat
-    {:ok, lat}
+    if is_number(mic_e.lat_degrees) and is_number(mic_e.lat_minutes) do
+      lat = mic_e.lat_degrees + mic_e.lat_minutes / 60.0
+      lat = if mic_e.lat_direction == :south, do: -lat, else: lat
+      {:ok, lat}
+    else
+      :error
+    end
   end
 
   def fetch(mic_e, :longitude) do
     # Calculate decimal longitude from components
-    lon = mic_e.lon_degrees + mic_e.lon_minutes / 60.0
-    lon = if mic_e.lon_direction == :west, do: -lon, else: lon
-    {:ok, lon}
+    if is_number(mic_e.lon_degrees) and is_number(mic_e.lon_minutes) do
+      lon = mic_e.lon_degrees + mic_e.lon_minutes / 60.0
+      lon = if mic_e.lon_direction == :west, do: -lon, else: lon
+      {:ok, lon}
+    else
+      :error
+    end
   end
 
   def fetch(mic_e, key) when is_atom(key) do
@@ -65,12 +73,16 @@ defmodule Parser.Types.MicE do
     value =
       case key do
         :latitude ->
-          lat = mic_e.lat_degrees + mic_e.lat_minutes / 60.0
-          if mic_e.lat_direction == :south, do: -lat, else: lat
+          if is_number(mic_e.lat_degrees) and is_number(mic_e.lat_minutes) do
+            lat = mic_e.lat_degrees + mic_e.lat_minutes / 60.0
+            if mic_e.lat_direction == :south, do: -lat, else: lat
+          end
 
         :longitude ->
-          lon = mic_e.lon_degrees + mic_e.lon_minutes / 60.0
-          if mic_e.lon_direction == :west, do: -lon, else: lon
+          if is_number(mic_e.lon_degrees) and is_number(mic_e.lon_minutes) do
+            lon = mic_e.lon_degrees + mic_e.lon_minutes / 60.0
+            if mic_e.lon_direction == :west, do: -lon, else: lon
+          end
 
         key when is_binary(key) ->
           # Handle string keys by converting to atom if it exists
diff --git a/test/aprs/packets_mic_e_test.exs b/test/aprs/packets_mic_e_test.exs
new file mode 100644
index 0000000..1d018c1
--- /dev/null
+++ b/test/aprs/packets_mic_e_test.exs
@@ -0,0 +1,164 @@
+defmodule Aprs.PacketsMicETest do
+  use Aprs.DataCase
+
+  alias Aprs.Packets
+  alias Parser.Types.MicE
+
+  describe "store_packet/1 with MicE data" do
+    test "stores packet with MicE data_extended successfully" do
+      # This test reproduces the exact error scenario from the bug report
+      mic_e_data = %MicE{
+        lat_degrees: 49,
+        lat_minutes: 14,
+        lat_fractional: 72,
+        lat_direction: :north,
+        lon_direction: :east,
+        longitude_offset: 100,
+        message_code: "M02",
+        message_description: "In Service",
+        dti: "`",
+        heading: 0,
+        lon_degrees: 12,
+        lon_minutes: 5,
+        lon_fractional: 75,
+        speed: 0,
+        manufacturer: "Kenwood TH-D74A",
+        message: ">Harald QRV R1298,625"
+      }
+
+      packet_data = %{
+        base_callsign: "DG1ID",
+        ssid: "9",
+        sender: "DG1ID-9",
+        destination: "APRS",
+        data_type: "mic_e",
+        path: "TCPIP*",
+        information_field: "MicE packet data",
+        data_extended: mic_e_data
+      }
+
+      # This should not raise a KeyError
+      assert {:ok, stored_packet} = Packets.store_packet(packet_data)
+
+      # Verify the packet was stored with correct position data
+      assert stored_packet.sender == "DG1ID-9"
+      assert stored_packet.has_position == true
+
+      # Verify coordinates were calculated correctly from MicE components
+      expected_lat = 49.0 + 14.0 / 60.0
+      expected_lon = 12.0 + 5.0 / 60.0
+
+      assert_in_delta stored_packet.lat, expected_lat, 0.001
+      assert_in_delta stored_packet.lon, expected_lon, 0.001
+    end
+
+    test "handles MicE data with south/west coordinates" do
+      mic_e_data = %MicE{
+        lat_degrees: 34,
+        lat_minutes: 30,
+        lat_fractional: 0,
+        lat_direction: :south,
+        lon_direction: :west,
+        longitude_offset: 100,
+        message_code: "M01",
+        message_description: "En Route",
+        dti: "`",
+        heading: 90,
+        lon_degrees: 118,
+        lon_minutes: 15,
+        lon_fractional: 30,
+        speed: 25,
+        manufacturer: "Kenwood TH-D74A",
+        message: "Test message"
+      }
+
+      packet_data = %{
+        base_callsign: "TEST",
+        ssid: "1",
+        sender: "TEST-1",
+        destination: "APRS",
+        data_type: "mic_e",
+        path: "WIDE1-1,WIDE2-2",
+        information_field: "MicE test packet",
+        data_extended: mic_e_data
+      }
+
+      assert {:ok, stored_packet} = Packets.store_packet(packet_data)
+
+      # Verify south latitude is negative
+      expected_lat = -(34.0 + 30.0 / 60.0)
+      # Verify west longitude is negative
+      expected_lon = -(118.0 + 15.0 / 60.0)
+
+      assert_in_delta stored_packet.lat, expected_lat, 0.001
+      assert_in_delta stored_packet.lon, expected_lon, 0.001
+      assert stored_packet.lat < 0
+      assert stored_packet.lon < 0
+    end
+
+    test "handles MicE data with missing position components gracefully" do
+      # Test with incomplete MicE data (missing some coordinate components)
+      incomplete_mic_e = %MicE{
+        lat_degrees: nil,
+        lat_minutes: 14,
+        lat_fractional: 72,
+        lat_direction: :north,
+        lon_direction: :east,
+        longitude_offset: 100,
+        message_code: "M02",
+        message_description: "In Service",
+        dti: "`",
+        heading: 0,
+        lon_degrees: 12,
+        lon_minutes: 5,
+        lon_fractional: 75,
+        speed: 0,
+        manufacturer: "Kenwood TH-D74A",
+        message: "Test incomplete"
+      }
+
+      packet_data = %{
+        base_callsign: "TEST",
+        ssid: "2",
+        sender: "TEST-2",
+        destination: "APRS",
+        data_type: "mic_e",
+        path: "TCPIP*",
+        information_field: "Incomplete MicE",
+        data_extended: incomplete_mic_e
+      }
+
+      # Should still store the packet, but without position data
+      assert {:ok, stored_packet} = Packets.store_packet(packet_data)
+      assert stored_packet.sender == "TEST-2"
+      # Should not have position data when components are missing
+      assert stored_packet.has_position != true || stored_packet.has_position == nil
+    end
+
+    test "MicE Access behavior works correctly" do
+      # Test the Access behavior implementation directly
+      mic_e = %MicE{
+        lat_degrees: 40,
+        lat_minutes: 30,
+        lat_fractional: 0,
+        lat_direction: :north,
+        lon_degrees: 74,
+        lon_minutes: 15,
+        lon_fractional: 0,
+        lon_direction: :west
+      }
+
+      # Test bracket notation (which triggers Access behavior)
+      assert mic_e[:latitude] == 40.5
+      assert mic_e[:longitude] == -74.25
+
+      # Test that we can access both calculated and direct fields
+      assert mic_e[:lat_degrees] == 40
+      assert mic_e[:message_code] == nil
+
+      # Test get_in works
+      assert get_in(mic_e, [:latitude]) == 40.5
+      assert get_in(mic_e, [:longitude]) == -74.25
+    end
+  end
+end
diff --git a/test/parser/parser_test.exs b/test/parser/parser_test.exs
index 0957cbc..cf48829 100644
--- a/test/parser/parser_test.exs
+++ b/test/parser/parser_test.exs
@@ -52,6 +52,46 @@ defmodule Parser.ParserTest do
     assert %MicE{} = sut
   end
 
+  test "mic_e latitude/longitude access" do
+    # Test the Access behavior for MicE structs
+    mic_e = %MicE{
+      lat_degrees: 49,
+      lat_minutes: 14,
+      lat_fractional: 72,
+      lat_direction: :north,
+      lon_degrees: 12,
+      lon_minutes: 5,
+      lon_fractional: 75,
+      lon_direction: :east
+    }
+
+    # Test bracket notation access (should work)
+    assert mic_e[:latitude] == 49 + 14 / 60.0
+    assert mic_e[:longitude] == 12 + 5 / 60.0
+
+    # Test that latitude/longitude are calculated correctly
+    expected_lat = 49.0 + 14.0 / 60.0
+    expected_lon = 12.0 + 5.0 / 60.0
+
+    assert_in_delta mic_e[:latitude], expected_lat, 0.001
+    assert_in_delta mic_e[:longitude], expected_lon, 0.001
+
+    # Test south/west directions
+    mic_e_sw = %MicE{
+      lat_degrees: 49,
+      lat_minutes: 14,
+      lat_fractional: 72,
+      lat_direction: :south,
+      lon_degrees: 12,
+      lon_minutes: 5,
+      lon_fractional: 75,
+      lon_direction: :west
+    }
+
+    assert mic_e_sw[:latitude] < 0
+    assert mic_e_sw[:longitude] < 0
+  end
+
   test "weird format" do
     aprs_message =
       ~s(ON4AVM-11>APDI23,WIDE1-1,WIDE2-2,qAR,ON0LB-10:=S4`k!OZ,C# sT/A=000049DIXPRS 2.3.0b\n)