diff --git a/docker-compose.yml b/docker-compose.yml
index 3aa1df8f..5e37be60 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -48,6 +48,8 @@ services:
       - ENCRYPTION_KEY
       - FQDN
       - GIT_BRANCH
+      - GPS_MODULE
+      - GPS_CLASS
       - GUNICORN_LOG_LEVEL
       - IN_DOCKER=1
       - IPS
diff --git a/env.template b/env.template
index 9a73c446..c51abb17 100644
--- a/env.template
+++ b/env.template
@@ -49,6 +49,8 @@ ENCRYPTION_KEY="$(python3 -c 'import secrets; import base64; print(base64.b64enc
 FQDN="$(hostname -f)"
 
 GIT_BRANCH="git:$(git rev-parse --abbrev-ref HEAD)@$(git rev-parse --short HEAD)"
+GPS_MODULE=""
+GPS_CLASS=""
 
 IPS="$(hostname -I) 127.0.0.1"
 
diff --git a/src/initialization/__init__.py b/src/initialization/__init__.py
index e97def1e..5166c4a3 100644
--- a/src/initialization/__init__.py
+++ b/src/initialization/__init__.py
@@ -20,7 +20,7 @@
 
 def get_usb_device_exists() -> bool:
     logger.debug("Checking for USB...")
-    if not settings.RUNNING_TESTS and settings.USB_DEVICE is not None:
+    if not settings.RUNNING_TESTS and settings.USB_DEVICE is not None and not settings.MOCK_SIGAN:
         usb_devices = check_output("lsusb").decode(sys.stdout.encoding)
         logger.debug("Checking for " + settings.USB_DEVICE)
         logger.debug("Found " + usb_devices)
diff --git a/src/initialization/action_loader.py b/src/initialization/action_loader.py
index f94fb5a1..3e99568b 100644
--- a/src/initialization/action_loader.py
+++ b/src/initialization/action_loader.py
@@ -91,18 +91,21 @@ def load_actions(
     discovered_plugins = {
         name: importlib.import_module(name)
         for finder, name, ispkg in pkgutil.iter_modules()
-        if name.startswith("scos_") and name != "scos_actions"
+        if name.startswith("scos_")
     }
     logger.debug(discovered_plugins)
     actions = {}
-    if mock_sigan or running_tests:
+    if running_tests:
         logger.debug(f"Loading {len(test_actions)} test actions.")
         actions.update(test_actions)
     else:
         for name, module in discovered_plugins.items():
             logger.debug("Looking for actions in " + name + ": " + str(module))
             discover = importlib.import_module(name + ".discover")
-            if hasattr(discover, "actions"):
+            if mock_sigan and hasattr(discover, "test_actions"):
+                logger.debug(f"loading {len(discover.test_actions)} test actions.")
+                actions.update(discover.test_actions)
+            elif hasattr(discover, "actions"):
                 logger.debug(f"loading {len(discover.actions)} actions.")
                 actions.update(discover.actions)
             if (
diff --git a/src/initialization/sensor_loader.py b/src/initialization/sensor_loader.py
index 7c0376ab..0ebb7cb9 100644
--- a/src/initialization/sensor_loader.py
+++ b/src/initialization/sensor_loader.py
@@ -70,6 +70,7 @@ def load_sensor(sensor_capabilities: dict) -> Sensor:
         )
 
     sigan = None
+    gps = None
     try:
         if not settings.RUNNING_MIGRATIONS:
             check_for_required_sigan_settings()
@@ -83,52 +84,33 @@ def load_sensor(sensor_capabilities: dict) -> Sensor:
                 sensor_cal=sensor_cal, sigan_cal=sigan_cal, switches=switches
             )
             register_component_with_status.send(sigan, component=sigan)
+
+            if settings.GPS_MODULE and settings.GPS_CLASS:
+                gps_module_setting = settings.GPS_MODULE
+                gps_module = importlib.import_module(gps_module_setting)
+                logger.info(
+                    "Creating " + settings.GPS_CLASS + " from " + settings.GPS_MODULE
+                )
+                gps_constructor = getattr(gps_module, settings.GPS_CLASS)
+                gps = gps_constructor(
+                    sigan=sigan
+                )
         else:
             logger.info("Running migrations. Not loading signal analyzer.")
     except Exception as ex:
         logger.warning(f"unable to create signal analyzer: {ex}")
 
-    gps = None
-    try:
-        if not settings.RUNNING_MIGRATIONS:
-            check_for_required_gps_settings()
-            gps_module_setting = settings.GPS_MODULE
-            gps_module = importlib.import_module(gps_module_setting)
-            logger.info(
-                "Creating " + settings.GPS_CLASS + " from " + settings.GPS_MODULE
-            )
-            gps_constructor = getattr(gps_module, settings.GPS_CLASS)
-            gps = gps_constructor()
-            register_component_with_status.send(gps, component=gps)
-        else:
-            logger.info("Running migrations. Not loading GPS.")
-    except Exception as ex:
-        logger.warning(f"unable to create GPS: {ex}")
-
     sensor = Sensor(
         signal_analyzer=sigan,
         capabilities=sensor_capabilities,
         preselector=preselector,
         switches=switches,
         location=location,
-        gps=gps,
+        gps=gps
     )
     return sensor
 
 
-def check_for_required_gps_settings():
-    error = ""
-    raise_exception = False
-    if settings.GPS_MODULE is None:
-        raise_exception = True
-        error = "GPS_MODULE environment variable must be set. "
-    if settings.GPS_CLASS is None:
-        raise_exception = True
-        error += "GPS_CLASS environment variable. "
-    if raise_exception:
-        raise Exception(error)
-
-
 def check_for_required_sigan_settings():
     error = ""
     raise_exception = False
diff --git a/src/requirements-dev.txt b/src/requirements-dev.txt
index 6f50321a..ca33da0e 100644
--- a/src/requirements-dev.txt
+++ b/src/requirements-dev.txt
@@ -78,6 +78,7 @@ django==3.2.24
     #   drf-yasg
     #   jsonfield
     #   scos-actions
+    #   scos-usrp
 django-session-timeout==0.1.0
     # via -r requirements.txt
 djangorestframework==3.14.0
@@ -90,7 +91,7 @@ environs==9.5.0
     # via
     #   -r requirements.txt
     #   scos-actions
-    #   scos-tekrsa
+    #   scos-usrp
 exceptiongroup==1.2.0
     # via pytest
 filelock==3.13.1
@@ -180,8 +181,8 @@ numpy==1.24.4
     #   ray
     #   scipy
     #   scos-actions
+    #   scos-usrp
     #   sigmf
-    #   tekrsa-api-wrap
 nvidia-ml-py==12.535.133
     # via gpustat
 oauthlib==3.2.2
@@ -315,11 +316,11 @@ scipy==1.10.1
     # via
     #   -r requirements.txt
     #   scos-actions
-scos-actions @ git+https://github.com/NTIA/scos-actions@8.0.0
+scos-actions @ git+https://github.com/NTIA/scos-actions@SEA-178_test_actions_loading
     # via
     #   -r requirements.txt
-    #   scos-tekrsa
-scos-tekrsa @ git+https://github.com/NTIA/scos-tekrsa@5.0.0
+    #   scos-usrp
+scos-usrp @ git+https://github.com/NTIA/scos-usrp@SEA-178_test_actions_loading
     # via -r requirements.txt
 sigmf @ git+https://github.com/NTIA/SigMF@multi-recording-archive
     # via
@@ -339,10 +340,6 @@ sqlparse==0.4.4
     # via
     #   -r requirements.txt
     #   django
-tekrsa-api-wrap==1.3.2
-    # via
-    #   -r requirements.txt
-    #   scos-tekrsa
 tomli==2.0.1
     # via
     #   coverage
diff --git a/src/requirements.in b/src/requirements.in
index 591bc41f..7354f4ae 100644
--- a/src/requirements.in
+++ b/src/requirements.in
@@ -11,7 +11,7 @@ packaging>=23.0, <24.0
 psycopg2-binary>=2.0, <3.0
 requests-mock>=1.0, <2.0
 requests_oauthlib>=1.0, <2.0
-scos_tekrsa @ git+https://github.com/NTIA/scos-tekrsa@5.0.0
+scos_usrp @ git+https://github.com/NTIA/scos-usrp@SEA-178_test_actions_loading
 
 # The following are sub-dependencies for which SCOS Sensor enforces a
 # higher minimum patch version than the dependencies which require them.
diff --git a/src/requirements.txt b/src/requirements.txt
index 59c9699d..7ecd0a93 100644
--- a/src/requirements.txt
+++ b/src/requirements.txt
@@ -32,6 +32,7 @@ django==3.2.24
     #   drf-yasg
     #   jsonfield
     #   scos-actions
+    #   scos-usrp
 django-session-timeout==0.1.0
     # via -r requirements.in
 djangorestframework==3.14.0
@@ -44,7 +45,7 @@ environs==9.5.0
     # via
     #   -r requirements.in
     #   scos-actions
-    #   scos-tekrsa
+    #   scos-usrp
 filelock==3.13.1
     # via
     #   -r requirements.in
@@ -89,8 +90,8 @@ numpy==1.24.4
     #   ray
     #   scipy
     #   scos-actions
+    #   scos-usrp
     #   sigmf
-    #   tekrsa-api-wrap
 oauthlib==3.2.2
     # via requests-oauthlib
 packaging==23.2
@@ -149,9 +150,9 @@ ruamel-yaml-clib==0.2.8
     # via ruamel-yaml
 scipy==1.10.1
     # via scos-actions
-scos-actions @ git+https://github.com/NTIA/scos-actions@8.0.0
-    # via scos-tekrsa
-scos-tekrsa @ git+https://github.com/NTIA/scos-tekrsa@5.0.0
+scos-actions @ git+https://github.com/NTIA/scos-actions@SEA-178_test_actions_loading
+    # via scos-usrp
+scos-usrp @ git+https://github.com/NTIA/scos-usrp@SEA-178_test_actions_loading
     # via -r requirements.in
 sigmf @ git+https://github.com/NTIA/SigMF@multi-recording-archive
     # via scos-actions
@@ -163,8 +164,6 @@ six==1.16.0
     #   sigmf
 sqlparse==0.4.4
     # via django
-tekrsa-api-wrap==1.3.2
-    # via scos-tekrsa
 typing-extensions==4.8.0
     # via asgiref
 uritemplate==4.1.1
diff --git a/src/sensor/settings.py b/src/sensor/settings.py
index 1bc97746..a2e0fe27 100644
--- a/src/sensor/settings.py
+++ b/src/sensor/settings.py
@@ -334,6 +334,8 @@
     DEVICE_MODEL = env("DEVICE_MODEL", default="RSA507A")
     SIGAN_MODULE = "scos_actions.hardware.mocks.mock_sigan"
     SIGAN_CLASS = "MockSignalAnalyzer"
+    GPS_MODULE = "scos_actions.hardware.mocks.mock_gps"
+    GPS_CLASS = "MockGPS"
 else:
     DATABASES = {
         "default": {
@@ -348,6 +350,8 @@
     DEVICE_MODEL = env("DEVICE_MODEL", default=None)
     SIGAN_MODULE = env.str("SIGAN_MODULE", default=None)
     SIGAN_CLASS = env.str("SIGAN_CLASS", default=None)
+    GPS_MODULE = env.str("GPS_MODULE", default=None)
+    GPS_CLASS = env.str("GPS_CLASS", default=None)
 
 if not IN_DOCKER:
     DATABASES["default"]["HOST"] = "localhost"