diff --git a/ogn/parser/pattern.py b/ogn/parser/pattern.py
index 4a48674..49a9c6c 100644
--- a/ogn/parser/pattern.py
+++ b/ogn/parser/pattern.py
@@ -11,7 +11,7 @@ PATTERN_NAVITER_BEACON = re.compile("""
 """, re.VERBOSE | re.MULTILINE)
 
 PATTERN_TRACKER_BEACON_POSITION = re.compile("""
-    id(?P<details>\w{2})(?P<id>\w{6}?)\s?
+    id(?P<details>[0-9A-F]{2})(?P<id>[0-9A-F]{6}?)\s?
     (?:(?P<climb_rate>[+-]\d+?)fpm\s)?
     (?:(?P<turn_rate>[+-][\d.]+?)rot\s)?
     (?:FL(?P<flight_level>[\d.]+)\s)?
@@ -114,7 +114,7 @@ PATTERN_RECEIVER_BEACON = re.compile(r"""
 
 
 PATTERN_AIRCRAFT_BEACON = re.compile(r"""
-    id(?P<details>\w{2})(?P<id>\w{6}?)\s?
+    id(?P<details>[0-9A-F]{2})(?P<id>[0-9A-F]{6}?)\s?
     (?:(?P<climb_rate>[+-]\d+?)fpm\s)?
     (?:(?P<turn_rate>[+-][\d.]+?)rot\s)?
     (?:FL(?P<flight_level>[\d.]+)\s)?
diff --git a/tests/parser/test_parse.py b/tests/parser/test_parse.py
index 1bff03c..986fca0 100644
--- a/tests/parser/test_parse.py
+++ b/tests/parser/test_parse.py
@@ -65,7 +65,7 @@ class TestStringMethods(unittest.TestCase):
 
     def test_fail_bad_dstcall(self):
         with self.assertRaises(OgnParseError):
-            parse("EPZR>WTFDSTCALL,TCPIP*,qAC,GLIDERN1:>093456h this is a comment")
+            parse("EPZR>WTFDSTCALL,TCPIP*,qAC,GLIDERN1:>093456h this is a comment", reference_date=datetime(2015, 1, 1))
 
     def test_v026_chile(self):
         # receiver beacons from chile have a APRS position message with a pure user comment
@@ -73,6 +73,10 @@ class TestStringMethods(unittest.TestCase):
 
         self.assertEqual(message['user_comment'], "Vitacura Municipal Aerodrome, Club de Planeadores Vitacura")
 
+        message_with_id = parse("ALFALFAL>APRS,TCPIP*,qAC,GLIDERN4:/221830h3330.40SI07007.88W&/A=008659 Alfalfal Hidroelectric Plant, Club de Planeadores Vitacurs", reference_date=datetime(2015, 1, 1))
+
+        self.assertEqual(message_with_id['user_comment'], "Alfalfal Hidroelectric Plant, Club de Planeadores Vitacurs")
+
     @mock.patch('ogn.parser.parse_module.createTimestamp')
     def test_default_reference_date(self, createTimestamp_mock):
         valid_aprs_string = "Lachens>APRS,TCPIP*,qAC,GLIDERN2:/165334h4344.70NI00639.19E&/A=005435 v0.2.1 CPU:0.3 RAM:1764.4/2121.4MB NTP:2.8ms/+4.9ppm +47.0C RF:+0.70dB"
diff --git a/tests/parser/valid_beacon_data/aprs_receiver.txt b/tests/parser/valid_beacon_data/aprs_receiver.txt
index 0f724ca..043870e 100644
--- a/tests/parser/valid_beacon_data/aprs_receiver.txt
+++ b/tests/parser/valid_beacon_data/aprs_receiver.txt
@@ -25,3 +25,6 @@ VITACURA2>APRS,TCPIP*,qAC,GLIDERN3:>042136h v0.2.5.ARM CPU:0.3 RAM:695.0/970.5MB
 # since 0.2.6 the ogn comment of a receiver beacon is just optional, it also can be a user comment
 Ulrichamn>APRS,TCPIP*,qAC,GLIDERN1:/085616h5747.30NI01324.77E&/A=001322
 ROBLE3>APRS,TCPIP*,qAC,GLIDERN4:/200022h3258.58SI07100.78W&/A=007229 Contact: achanes@manquehue.net, brito.felipe@gmail.com
+#
+# ... and user comment can include a 'id'
+ALFALFAL>APRS,TCPIP*,qAC,GLIDERN4:/221830h3330.40SI07007.88W&/A=008659 Alfalfal Hidroelectric Plant, Club de Planeadores Vitacurs
\ No newline at end of file