diff --git a/pynmea2/types/proprietary/tnl.py b/pynmea2/types/proprietary/tnl.py
index 8f2257c..567c46b 100644
--- a/pynmea2/types/proprietary/tnl.py
+++ b/pynmea2/types/proprietary/tnl.py
@@ -1,6 +1,7 @@
 # -- TRIMBLE -- #
 
 # pylint: disable=wildcard-import,unused-wildcard-import
+from decimal import Decimal
 from ... import nmea
 from ...nmea_utils import *
 """ Support for proprietary messages from BD9xx recievers.
@@ -16,15 +17,15 @@ def __new__(_cls, manufacturer, data):
         '''
             Return the correct sentence type based on the first field
         '''
-        sentence_type = data[0] or data[1]
+        sentence_type = data[1]
         name = manufacturer + sentence_type
-        cls = _cls.sentence_types.get(name, _cls)
+        if name not in _cls.sentence_types:
+            # TNLDG does not have a sentence type
+            if TNLDG.match(data):
+                return super(TNL, TNLDG).__new__(TNLDG)
+        cls = _cls.sentence_types.get(name, TNL)
         return super(TNL, cls).__new__(cls)
 
-    def __init__(self, manufacturer, data):
-        self.sentence_type = data[0] or data[1]
-        super(TNL, self).__init__(manufacturer, data)
-
 
 class TNLAVR(TNL):
     """
@@ -66,6 +67,29 @@ class TNLBPQ(TNL, LatLonFix, DatetimeFix):
         ('Total number of satelites in use', 'num_sats'),
     )
 
+class TNLDG(TNL):
+    """
+        Trimble DG message (L-band, beacon signal strength, etc)
+    """
+    @staticmethod
+    def match(data):
+        return re.match(r'\d+\.\d{1}', data[1])
+
+    def __init__(self, *args, **kwargs):
+        self.subtype = 'DG'
+        super(TNLDG, self).__init__(*args, **kwargs)
+
+    fields = (
+        ('Empty', '_'),
+        ('Signal strength', 'strength', float),
+        ('SNR in db', 'snr', float),
+        ('Signal frequency in kHz', 'frequency', float),
+        ('Bit rate', 'bitrate', Decimal),
+        ('Channel number', 'channel_no', Decimal),
+        ('Tracking status', 'status'),
+        ('Channel used', 'channel_used'),
+        ('Tracking performance indicator', 'performance', Decimal),
+    )
 
 class TNLGGK(TNL, LatLonFix, DatetimeFix):
     """
@@ -89,6 +113,24 @@ class TNLGGK(TNL, LatLonFix, DatetimeFix):
     )
 
 
+class TNLVGK(TNL, DatetimeFix):
+    """
+        Trimble VGK (vector information) message
+    """
+    fields = (
+        ('Empty', '_'),
+        ('Sentence Type', 'type'),
+        ('Timestamp', 'timestamp', timestamp),
+        ('Datestamp', 'datestamp', datestamp),
+        ('East component', 'east', float),
+        ('North component', 'north', float),
+        ('Up component', 'up', float),
+        ('GPS Quality', 'gps_quality'),
+        ('Number of satelites', 'num_sats', Decimal),
+        ('DOP of fix', 'dop', float),
+        ('Meters', 'meters'),
+    )
+
 class TNLVHD(TNL, DatetimeFix):
     """
         Trimble VHD Message
@@ -97,18 +139,37 @@ class TNLVHD(TNL, DatetimeFix):
         ('Empty', '_'),
         ('Sentence Type', 'type'),
         ('Timestamp', 'timestamp', timestamp),
-        ("Datestamp", "datestamp", datestamp),
-        ('Azimuth Angle', 'azimuth'),
-        ('AzimuthTime', 'azdt'),
-        ('Vertical Angle', 'vertical'),
-        ('VerticalTime', 'vertdt'),
-        ('Range', 'range'),
-        ('RangeTime', 'rdt'),
+        ('Datestamp', 'datestamp', datestamp),
+        ('Azimuth Angle', 'azimuth', float),
+        ('AzimuthTime', 'azdt', float),
+        ('Vertical Angle', 'vertical', float),
+        ('VerticalTime', 'vertdt', float),
+        ('Range', 'range', float),
+        ('RangeTime', 'rdt', float),
         ('GPS Quality', 'gps_quality'),
-        ('Total number of satelites in use', 'num_sats'),
-        ('PDOP', 'pdop'),
+        ('Total number of satelites in use', 'num_sats', Decimal),
+        ('PDOP', 'pdop', float),
     )
 
+class TNLPJK(TNL, DatetimeFix):
+    """
+        Trimble PJK message
+    """
+    fields = (
+        ('Empty', '_'),
+        ('Sentence Type', 'type'),
+        ('Timestamp', 'timestamp', timestamp),
+        ('Datestamp', 'datestamp', datestamp),
+        ('Northing', 'northing', float),
+        ('North', 'north'),
+        ('Easting', 'easting', float),
+        ('East', 'east'),
+        ('GPS Quality', 'gps_quality'),
+        ('Number of satellites', 'num_sats', Decimal),
+        ('DOP of fix', 'dop', float),
+        ('Height of antenna phase center', 'height'),
+        ('Meters', 'meters'),
+    )
 
 class TNLPJT(TNL):
     """
diff --git a/test/test_proprietary.py b/test/test_proprietary.py
index ce6aea3..08ee8be 100644
--- a/test/test_proprietary.py
+++ b/test/test_proprietary.py
@@ -63,27 +63,19 @@ class ABC(pynmea2.ProprietarySentence):
 
 
 def test_proprietary_with_comma():
-    # class with no extra comma
-    class TNLDG(pynmea2.tnl.TNL):
-        fields = ()
-
-    # raise Exception(TNL.sentence_types)
-    # raise Exception(pynmea2.ProprietarySentence.sentence_types)
-
     data = "$PTNLDG,44.0,33.0,287.0,100,0,4,1,0,,,*3E"
     msg = pynmea2.parse(data)
-    assert isinstance(msg, TNLDG)
+    assert isinstance(msg, pynmea2.tnl.TNLDG)
     assert msg.data == ['DG', '44.0', '33.0', '287.0', '100', '0', '4', '1', '0', '', '', '']
     assert str(msg) == data
 
-
     # type with extra comma
 
     data = '$PTNL,PJT,NAD83(Conus),CaliforniaZone 4 0404*51'
     msg = pynmea2.parse(data)
     assert type(msg) == pynmea2.tnl.TNLPJT
     assert msg.manufacturer == 'TNL'
-    assert msg.sentence_type == 'PJT'
+    assert msg.type == 'PJT'
     assert msg.coord_name == 'NAD83(Conus)'
     assert msg.project_name == 'CaliforniaZone 4 0404'
     assert str(msg) == data
diff --git a/test/test_tnl.py b/test/test_tnl.py
new file mode 100644
index 0000000..06383b8
--- /dev/null
+++ b/test/test_tnl.py
@@ -0,0 +1,109 @@
+from decimal import Decimal
+import datetime
+
+import pynmea2
+
+def test_tnlpjk():
+    data = '$PTNL,PJK,202831.50,011112,+805083.350,N,+388997.346,E,10,09,1.5,GHT+25.478,M*77'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLPJK
+    assert msg.manufacturer == 'TNL'
+    assert msg.type == 'PJK'
+    assert msg.timestamp == datetime.time(20, 28, 31, 500000, tzinfo=datetime.timezone.utc)
+    assert msg.datestamp == datetime.date(2012, 11, 1)
+    assert msg.northing == 805083.350
+    assert msg.north == 'N'
+    assert msg.easting == 388997.346
+    assert msg.east == 'E'
+    assert msg.gps_quality == '10'
+    assert msg.num_sats == 9
+    assert msg.dop == 1.5
+    assert msg.height == 'GHT+25.478'
+
+def test_tnlpjk2():
+    # not sure if this is correct checksum, because of too long (for NMEA standard) msg
+    data = '$PTNL,PJK,010717.00,170896,+732646.511,N,+1731051.091,E,1,05,2.7,EHT+28.345,M*7A'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLPJK
+    assert msg.manufacturer == 'TNL'
+    assert msg.type == 'PJK'
+    assert msg.timestamp == datetime.time(1, 7, 17, 0, tzinfo=datetime.timezone.utc)
+    assert msg.datestamp == datetime.date(1996, 8, 17)
+    assert msg.northing == 732646.511
+    assert msg.north == 'N'
+    assert msg.easting == 1731051.091
+    assert msg.east == 'E'
+    assert msg.gps_quality == '1'
+    assert msg.num_sats == 5
+    assert msg.dop == 2.7
+    assert msg.height == 'EHT+28.345'
+
+def test_tnlpjt():
+    data = '$PTNL,PJT,NAD83(Conus),California Zone 4 0404,*5D'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLPJT
+    assert msg.manufacturer == 'TNL'
+    assert msg.type == 'PJT'
+    assert msg.coord_name == 'NAD83(Conus)'
+    assert msg.project_name == 'California Zone 4 0404'
+
+def test_tnldg_beacon():
+    data = '$PTNLDG,44.0,33.0,287.0,100,0,4,1,0,,,*3E'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLDG
+    assert msg.manufacturer == 'TNL'
+    assert msg.strength == 44.0
+    assert msg.snr == 33.0
+    assert msg.frequency == 287.0
+    assert msg.bitrate == 100
+    assert msg.channel_no == 0
+    assert msg.status == '4'
+    assert msg.channel_used == '1'
+    assert msg.performance == 0
+
+def test_tnldg_lband():
+    data = '$PTNLDG,124.0,10.5,1557855.0,1200,2,4,0,3,,,*3C'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLDG
+    assert msg.manufacturer == 'TNL'
+    assert msg.strength == 124.0
+    assert msg.snr == 10.5
+    assert msg.frequency == 1557855.0
+    assert msg.bitrate == 1200
+    assert msg.channel_no == 2
+    assert msg.status == '4'
+    assert msg.channel_used == '0'
+    assert msg.performance == 3
+
+def test_tnlvgk():
+    data = '$PTNL,VGK,160159.00,010997,-0000.161,00009.985,-0000.002,3,07,1.4,M*0B'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLVGK
+    assert msg.manufacturer == 'TNL'
+    assert msg.type == 'VGK'
+    assert msg.timestamp == datetime.time(16, 1, 59, 0, tzinfo=datetime.timezone.utc)
+    assert msg.datestamp == datetime.date(1997, 9, 1)
+    assert msg.east == -0.161
+    assert msg.north == 9.985
+    assert msg.up == -0.002
+    assert msg.gps_quality == '3'
+    assert msg.num_sats == 7
+    assert msg.dop == 1.4
+
+def test_tnlvhd():
+    data = '$PTNL,VHD,030556.00,300998,187.718,-22.138,-76.929,-5.015,0.033,0.006,3,07,2.4,M*22'
+    msg = pynmea2.parse(data)
+    assert type(msg) == pynmea2.tnl.TNLVHD
+    assert msg.manufacturer == 'TNL'
+    assert msg.type == 'VHD'
+    assert msg.timestamp == datetime.time(3, 5, 56, 0, tzinfo=datetime.timezone.utc)
+    assert msg.datestamp == datetime.date(1998, 9, 30)
+    assert msg.azimuth == 187.718
+    assert msg.azdt == -22.138
+    assert msg.vertical == -76.929
+    assert msg.vertdt == -5.015
+    assert msg.range == 0.033
+    assert msg.rdt == 0.006
+    assert msg.gps_quality == '3'
+    assert msg.num_sats == 7
+    assert msg.pdop == 2.4