diff --git a/boatdata.py b/boatdata.py
index d25ad57..3f1f30c 100644
--- a/boatdata.py
+++ b/boatdata.py
@@ -58,7 +58,7 @@ Normale Daten erweitert
 -----------------------
 
 ROLL - Roll - Krängen / Rotation in Querrichtung
-PTCH - Pitch - Rollen / Rotation in Längsrichtung
+PTCH - Pitch - Stampfen / Rotation in Längsrichtung
 YAW - Yaw - Gieren / Rotation um die Senkrechte Achse
 
 XDR-Daten
@@ -370,6 +370,18 @@ class SatelliteList():
     def delSat(self, pnr_num):
         pass
 
+class AISTarget():
+    # FUTURE
+    def __init__(self):
+        self.mmsi = None
+        self.aiscls = None # class A or B
+        self.name = None
+        self.cog = None
+        self.sog = None
+
+class AIS():
+    def __init__(self):
+        target = {}
 
 class BoatData():
 
@@ -501,6 +513,11 @@ class BoatData():
             else:
                 raise ValueError(f"duplicate key '{instance}'")
 
+    def addSatellite(self, prn_num):
+        if not prn_num in self.sat:
+            self.sat[prn_num] = Satellite(prn_num)
+            self.sat[prn_num].status = 0
+
     def updateSatellite(self, prn_num, elevation, azimuth, snr, rres, status):
         if not prn_num in self.sat:
             self.sat[prn_num] = Satellite(prn_num)
@@ -523,7 +540,7 @@ class BoatData():
             out += str(t)
         out += "  Satellite info\n"
         for s in self.sat.values():
-            out += str(s)
+            out += "    {}".format(str(s))
         return out
 
     def updateValid(self, age=None):