diff --git a/ORBIT/phases/install/quayside_assembly_tow/gravity_base.py b/ORBIT/phases/install/quayside_assembly_tow/gravity_base.py
index 665f6d7c..a25e4404 100644
--- a/ORBIT/phases/install/quayside_assembly_tow/gravity_base.py
+++ b/ORBIT/phases/install/quayside_assembly_tow/gravity_base.py
@@ -5,9 +5,11 @@
 __maintainer__ = "Jake Nunemaker"
 __email__ = "jake.nunemaker@nrel.gov"
 
+from warnings import warn
 
 import simpy
 from marmot import le, process
+
 from ORBIT.core import Vessel, WetStorage
 from ORBIT.phases.install import InstallPhase
 
@@ -25,11 +27,13 @@ class GravityBasedInstallation(InstallPhase):
 
     #:
     expected_config = {
-        "support_vessel": "str",
+        "support_vessel": "str, (optional)",
+        "ahts_vessel": "str",
         "towing_vessel": "str",
         "towing_vessel_groups": {
             "towing_vessels": "int",
-            "station_keeping_vessels": "int",
+            "station_keeping_vessels": "int (optional)",
+            "ahts_vessels": "int (optional, default: 1)",
             "num_groups": "int (optional)",
         },
         "substructure": {
@@ -210,20 +214,49 @@ def initialize_queue(self):
 
     def initialize_support_vessel(self, **kwargs):
         """
+        ** The support vessel is deprecated and an AHTS
+        vessel will perform the installation with the towing group.
+        # TODO: determine if the installation process for GBF is still
+        sound.
+
         Initializes Multi-Purpose Support Vessel to perform installation
         processes at site.
         """
 
-        specs = self.config["support_vessel"]
-        vessel = self.initialize_vessel("Multi-Purpose Support Vessel", specs)
+        specs = self.config.get("support_vessel", None)
+
+        if specs is not None:
+            warn(
+                "support_vessel will be deprecated and replaced with"
+                " towing_vessels and ahts_vessel in the towing groups.\n",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
+        specs = self.config["ahts_vessel"]
+        vessel = self.initialize_vessel("Multi-Purpose AHTS Vessel", specs)
 
         self.env.register(vessel)
         vessel.initialize(mobilize=False)
         self.support_vessel = vessel
 
-        station_keeping_vessels = self.config["towing_vessel_groups"][
-            "station_keeping_vessels"
-        ]
+        station_keeping_vessels = self.config["towing_vessel_groups"].get(
+            "station_keeping_vessels", None
+        )
+
+        if station_keeping_vessels is not None:
+            print(station_keeping_vessels)
+            warn(
+                "['towing_vessl_groups]['station_keeping_vessels']"
+                " will be deprecated and replaced with"
+                " ['towing_vessl_groups]['ahts_vessels'].\n",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
+        station_keeping_vessels = self.config["towing_vessel_groups"].get(
+            "ahts_vessels", 1
+        )
 
         install_gravity_base_foundations(
             self.support_vessel,
diff --git a/tests/phases/install/quayside_assembly_tow/test_gravity_based.py b/tests/phases/install/quayside_assembly_tow/test_gravity_based.py
index dafad84b..84c57b9d 100644
--- a/tests/phases/install/quayside_assembly_tow/test_gravity_based.py
+++ b/tests/phases/install/quayside_assembly_tow/test_gravity_based.py
@@ -5,6 +5,7 @@
 __maintainer__ = "Jake Nunemaker"
 __email__ = "jake.nunemaker@nrel.gov"
 
+from copy import deepcopy
 
 import pandas as pd
 import pytest
@@ -56,3 +57,20 @@ def test_for_complete_logging(weather, config):
     assert ~df["cost"].isnull().any()
     _ = sim.agent_efficiencies
     _ = sim.detailed_output
+
+
+def test_deprecated_vessel():
+
+    deprecated = deepcopy(config)
+    deprecated["support_vessel"] = "test_support_vessel"
+
+    with pytest.deprecated_call():
+        sim = GravityBasedInstallation(deprecated)
+        sim.run()
+
+    deprecated2 = deepcopy(config)
+    deprecated2["towing_vessel_groups"]["station_keeping_vessels"] = 2
+
+    with pytest.deprecated_call():
+        sim = GravityBasedInstallation(deprecated2)
+        sim.run()
diff --git a/tests/phases/install/quayside_assembly_tow/test_moored.py b/tests/phases/install/quayside_assembly_tow/test_moored.py
index 3892495b..17dd0cb0 100644
--- a/tests/phases/install/quayside_assembly_tow/test_moored.py
+++ b/tests/phases/install/quayside_assembly_tow/test_moored.py
@@ -80,7 +80,7 @@ def test_for_complete_logging(weather, config):
     assert installed_mooring_lines == sim.num_turbines
 
 
-def test_deprecated_landfall():
+def test_deprecated_vessel():
 
     deprecated = deepcopy(config)
     deprecated["support_vessel"] = "test_support_vessel"