diff --git a/ogn/model/aircraft_beacon.py b/ogn/model/aircraft_beacon.py
index 61fb0e7..f9439c1 100644
--- a/ogn/model/aircraft_beacon.py
+++ b/ogn/model/aircraft_beacon.py
@@ -12,17 +12,17 @@ class AircraftBeacon(Beacon):
     aircraft_type = Column(SmallInteger)
     stealth = Column(Boolean)
     address = Column(String(6))
-    climb_rate = Column(Float)
-    turn_rate = Column(Float)
-    flightlevel = Column(Float)
-    signal_quality = Column(Float)
-    error_count = Column(Integer)
-    frequency_offset = Column(Float)
+    climb_rate = Column(Float(precision=2))
+    turn_rate = Column(Float(precision=2))
+    flightlevel = Column(Float(precision=2))
+    signal_quality = Column(Float(precision=2))
+    error_count = Column(SmallInteger)
+    frequency_offset = Column(Float(precision=2))
     gps_status = Column(String)
-    software_version = Column(Float)
+    software_version = Column(Float(precision=2))
     hardware_version = Column(SmallInteger)
     real_address = Column(String(6))
-    signal_power = Column(Float)
+    signal_power = Column(Float(precision=2))
 
     proximity = None
     gps_satellites = None
@@ -37,6 +37,7 @@ class AircraftBeacon(Beacon):
     relays = None
 
     # Calculated values
+    status = Column(SmallInteger, default=0)
     distance = Column(Float)
     location_mgrs = Column(String(15), index=True)
 
diff --git a/ogn/model/beacon.py b/ogn/model/beacon.py
index 6b3e2cc..56a0326 100644
--- a/ogn/model/beacon.py
+++ b/ogn/model/beacon.py
@@ -12,7 +12,7 @@ class Beacon(AbstractConcreteBase, Base):
 
     # APRS data
     location_wkt = Column('location', Geometry('POINT', srid=4326))
-    altitude = Column(Integer)
+    altitude = Column(Float(precision=2))
 
     name = Column(String)
     receiver_name = Column(String(9))
@@ -21,7 +21,7 @@ class Beacon(AbstractConcreteBase, Base):
     symboltable = None
     symbolcode = None
     track = Column(Integer)
-    ground_speed = Column(Float)
+    ground_speed = Column(Float(precision=2))
     comment = None
 
     relay = None
diff --git a/ogn/model/receiver_beacon.py b/ogn/model/receiver_beacon.py
index ba6fa39..aa86228 100644
--- a/ogn/model/receiver_beacon.py
+++ b/ogn/model/receiver_beacon.py
@@ -10,22 +10,22 @@ class ReceiverBeacon(Beacon):
     # ReceiverBeacon specific data
     version = Column(String)
     platform = Column(String)
-    cpu_load = Column(Float)
-    free_ram = Column(Float)
-    total_ram = Column(Float)
-    ntp_error = Column(Float)
-    rt_crystal_correction = Column(Float)
-    voltage = Column(Float)
-    amperage = Column(Float)
-    cpu_temp = Column(Float)
+    cpu_load = Column(Float(precision=2))
+    free_ram = Column(Float(precision=2))
+    total_ram = Column(Float(precision=2))
+    ntp_error = Column(Float(precision=2))
+    rt_crystal_correction = Column(Float(precision=2))
+    voltage = Column(Float(precision=2))
+    amperage = Column(Float(precision=2))
+    cpu_temp = Column(Float(precision=2))
     senders_visible = Column(Integer)
     senders_total = Column(Integer)
     rec_crystal_correction = 0       # obsolete since 0.2.0
     rec_crystal_correction_fine = 0  # obsolete since 0.2.0
-    rec_input_noise = Column(Float)
-    senders_signal = Column(Float)
+    rec_input_noise = Column(Float(precision=2))
+    senders_signal = Column(Float(precision=2))
     senders_messages = Column(Integer)
-    good_senders_signal = Column(Float)
+    good_senders_signal = Column(Float(precision=2))
     good_senders = Column(Integer)
     good_and_bad_senders = Column(Integer)