diff --git a/src/server/BreCal/database/sql_utils.py b/src/server/BreCal/database/sql_utils.py
index 6c99818..cd2606d 100644
--- a/src/server/BreCal/database/sql_utils.py
+++ b/src/server/BreCal/database/sql_utils.py
@@ -40,6 +40,53 @@ def get_port_ids_for_participant_id(participant_id:int):
     pdata = execute_sql_query_standalone(query=query, param={"participant_id":participant_id})
     return pdata
 
+def filter_berths_by_port(berths:list[model.Berth], participant:model.Participant)->list[model.Berth]:
+    """
+    this function filters a list of berths by the participant's assigned ports.
+
+    Uses:
+        berth.port_id (the port's int id of each berth)
+        Participant.ports (a list of int ids)
+    
+    returns: berths (filtered)
+    """
+    berths = [berth for berth in berths if berth.port_id in participant.ports]
+    return berths
+
+
+def filter_berths_by_users_assigned_ports(berths:list[model.Berth], user_data:dict, commands=None)->list[model.Berth]:
+    """
+    this function uses the user_id to filter a list of berths. Only those berths, which belong to the Participant's assigned
+    port list are relevant.
+
+    Uses:
+        berth.port_id (the port's int id of each berth)
+
+        user_data 'id' to obtain Participant
+        Participant.ports (a list of int ids)
+    
+    returns: berths
+    """
+    assert 'id' in list(user_data.keys())
+
+    if commands is None:
+        pooledConnection = local_db.getPoolConnection()
+        commands = pydapper.using(pooledConnection)
+
+    # filter: return only the relevant berths to a user, which belong to his assigned ports
+    user_participant_query = SQLQuery.get_participant_by_user_id()
+
+    # use the user's id to obtain the matching participant
+    sentinel = object()
+    participant = commands.query_single_or_default(
+        user_participant_query, default=sentinel, model=model.Participant, 
+        param={"userid":user_data.get("id")})
+    if participant is sentinel:
+        raise Exception(f"could not find a user with id {user_data.get('id')}")
+    berths = filter_berths_by_port(berths, participant)
+    return berths
+
+
 def filter_shipcalls_by_port(shipcalls:list[model.Shipcall], participant:model.Participant)->list[model.Shipcall]:
     """
     this function filters a list of shipcalls by the participant's assigned ports.
diff --git a/src/server/BreCal/impl/berths.py b/src/server/BreCal/impl/berths.py
index f00a9e8..0920d71 100644
--- a/src/server/BreCal/impl/berths.py
+++ b/src/server/BreCal/impl/berths.py
@@ -4,6 +4,7 @@ import pydapper
 
 from ..schemas import model
 from .. import local_db
+from BreCal.database.sql_utils import filter_berths_by_users_assigned_ports
 
 def GetBerths(options):
     """