diff --git a/aodndata/aatams/aatams_sattag_schema.py b/aodndata/aatams/aatams_sattag_schema.py
index e579b7ac..7d280a48 100644
--- a/aodndata/aatams/aatams_sattag_schema.py
+++ b/aodndata/aatams/aatams_sattag_schema.py
@@ -28,6 +28,7 @@
     "ctd",
     "diag",
     "dive",
+    "gps",
     "haulout",
     "ssmoutputs",
     "summary",
@@ -189,7 +190,7 @@ def check_len_list(alen, alist):
       bool: True or False
 
     """
-    return alen == len(alist)
+    return alen >= len(alist)
 
 
 def check_csv_tablename(table_names, csv_filenames):
@@ -527,6 +528,41 @@ def check_name_of_csv_files_is_correct(files):
     "cid": METADATA_SCHEMA["sattag_program"],
 }
 
+GPS_SCHEMA = {
+    "ref": METADATA_SCHEMA["sattag_program"],
+    "ptt": METADATA_SCHEMA["ptt"],
+    "d_date": Or(CSV_DATE_ISO),
+    "nsats_detected": CSV_POSITIVE_INT,
+    "nsats_transmitted": CSV_POSITIVE_INT,
+    "gps_mode": CSV_POSITIVE_INT,
+    "pseudoranges": str, 
+    "max_csn": str,
+    "cnt": CSV_POSITIVE_INT,
+    "lat": Or(CSV_EMPTY, CSV_LATITUDE),
+    "lon": Or(CSV_EMPTY, CSV_LONGITUDE),
+    "residual": Or(CSV_EMPTY, CSV_FLOAT),
+    "timeshift": Or(CSV_EMPTY, CSV_FLOAT),
+    "submitted": Or(CSV_EMPTY, CSV_DATE_ISO),
+    "nsats_healthy": Or(CSV_EMPTY, CSV_POSITIVE_INT),
+    "nbits": Or(CSV_EMPTY, CSV_POSITIVE_INT),
+    "deleted": str,
+    "v_mask": Or(CSV_EMPTY, CSV_POSITIVE_INT),
+    "km_from_home": Or(CSV_EMPTY, CSV_FLOAT),
+    "est_speed": Or(CSV_EMPTY, CSV_FLOAT),
+    "gps_number": Or(CSV_EMPTY, CSV_POSITIVE_INT),
+    "tx_date": Or(CSV_EMPTY, CSV_DATE_ISO),
+    "uplink_number": Or(CSV_EMPTY, CSV_POSITIVE_INT),
+    "tagging_id": Or(CSV_EMPTY, CSV_INT),
+    "d_date_tag": Or(CSV_EMPTY, CSV_DATE_ISO),
+    "ssm_lon": Or(CSV_EMPTY, CSV_LONGITUDE),
+    "ssm_lat": Or(CSV_EMPTY, CSV_LATITUDE),
+    "ssm_x": Or(CSV_EMPTY, CSV_FLOAT),
+    "ssm_y": Or(CSV_EMPTY, CSV_FLOAT),
+    "ssm_x_se": Or(CSV_EMPTY, CSV_FLOAT),
+    "ssm_y_se": Or(CSV_EMPTY, CSV_FLOAT),
+    "cid": METADATA_SCHEMA["sattag_program"],
+}
+
 HAULOUT_SCHEMA = {
     "ref": METADATA_SCHEMA["sattag_program"],
     "ptt": METADATA_SCHEMA["ptt"],
@@ -669,6 +705,7 @@ def __init__(self, skip_every=0, bulk_load=True, dialect_csv=None):
             "ctd": CTD_SCHEMA,
             "diag": DIAG_SCHEMA,
             "dive": DIVE_SCHEMA,
+            "gps": GPS_SCHEMA,
             "haulout": HAULOUT_SCHEMA,
             "ssmoutputs": SSMOUTPUTS_SCHEMA,
             "summary": SUMMARY_SCHEMA,
@@ -680,6 +717,7 @@ def __init__(self, skip_every=0, bulk_load=True, dialect_csv=None):
                 "ctd": "cid",
                 "diag": "cid",
                 "dive": "cid",
+                "gps": "cid",
                 "haulout": "cid",
                 "ssmoutputs": "cid",
                 "summary": "cid",
@@ -690,6 +728,7 @@ def __init__(self, skip_every=0, bulk_load=True, dialect_csv=None):
         self.ctd = {}
         self.diag = {}
         self.dive = {}
+        self.gps = {}
         self.haulout = {}
         self.ssmoutputs = {}
         self.summary = {}