diff --git a/echopype/consolidate/api.py b/echopype/consolidate/api.py
index cf5f2c50a..2388b0ead 100644
--- a/echopype/consolidate/api.py
+++ b/echopype/consolidate/api.py
@@ -30,7 +30,7 @@
 
 def swap_dims_channel_frequency(ds: Union[xr.Dataset, str, pathlib.Path]) -> xr.Dataset:
     """
-    Use frequency_nominal in place of channel to be dataset dimension and coorindate.
+    Use frequency_nominal in place of channel to be dataset dimension and coordinate.
 
     This is useful because the nominal transducer frequencies are commonly used to
     refer to data collected from a specific transducer.
@@ -349,6 +349,7 @@ def add_splitbeam_angle(
     pulse_compression: bool = False,
     storage_options: dict = {},
     to_disk: bool = True,
+    use_frequency_nominal: bool = False,
 ) -> xr.Dataset:
     """
     Add split-beam (alongship/athwartship) angles into the Sv dataset.
@@ -390,6 +391,9 @@ def add_splitbeam_angle(
         If ``False``, ``to_disk`` with split-beam angles added will be returned.
         ``to_disk=True`` is useful when ``source_Sv`` is a path and
         users only want to write the split-beam angle data to this path.
+    use_frequency_nominal: bool, default=False
+        If ``True``, the split-beam angles will be calculated using the
+        ``frequency_nominal`` variable in ``source_Sv``.
 
     Returns
     -------
@@ -459,7 +463,11 @@ def add_splitbeam_angle(
     if "channel" not in source_Sv.variables:
         raise ValueError("The input source_Sv Dataset must have a channel dimension!")
 
-    # Select ds_beam channels from source_Sv
+    # Swap the dimension to frequency_nominal if use_frequency_nominal is True
+    if use_frequency_nominal:
+        source_Sv = swap_dims_channel_frequency(source_Sv)
+
+    # Select ds_beam dimension from source_Sv
     ds_beam = echodata[ed_beam_group].sel(channel=source_Sv["channel"].values)
 
     # Assemble angle param dict
diff --git a/echopype/consolidate/split_beam_angle.py b/echopype/consolidate/split_beam_angle.py
index a269d70c4..5e68d49a4 100644
--- a/echopype/consolidate/split_beam_angle.py
+++ b/echopype/consolidate/split_beam_angle.py
@@ -151,7 +151,9 @@ def _e2f(angle_type: str) -> xr.Dataset:
 
 
 def get_angle_complex_samples(
-    ds_beam: xr.Dataset, angle_params: dict, pc_params: dict = None
+    ds_beam: xr.Dataset,
+    angle_params: dict,
+    pc_params: dict = None,
 ) -> Tuple[xr.DataArray, xr.DataArray]:
     """
     Obtain split-beam angle from CW or BB mode complex samples.
diff --git a/echopype/test_data/README.md b/echopype/test_data/README.md
index d3295604e..c79ad71f3 100644
--- a/echopype/test_data/README.md
+++ b/echopype/test_data/README.md
@@ -11,8 +11,6 @@ Most of these files are stored on Git LFS but the ones that aren't (due to file
 - 2019118 group2survey-D20191214-T081342.raw: Contains 6 channels but only 2 of those channels collect ping data
 - D20200528-T125932.raw: Data collected from WBT mini (instead of WBT), from @emlynjdavies
 - Green2.Survey2.FM.short.slow.-D20191004-T211557.raw: Contains 2-in-1 transducer, from @FletcherFT (reduced from 104.9 MB to 765 KB in test data updates)
-- raw4-D20220514-T172704.raw: Contains RAW4 datagram, 1 channel only, from @cornejotux
-- D20210330-T123857.raw: do not contain filter coefficients
 
 
 ### EA640
@@ -24,7 +22,6 @@ Most of these files are stored on Git LFS but the ones that aren't (due to file
 - Winter2017-D20170115-T150122.raw: Contains a change of recording length in the middle of the file
 - 2015843-D20151023-T190636.raw: Not used in tests but contains ranges are not constant across ping times
 - SH1701_consecutive_files_w_range_change: Not used in tests. [Folder](https://drive.google.com/drive/u/1/folders/1PaDtL-xnG5EK3N3P1kGlXa5ub16Yic0f) on shared drive that contains sequential files with ranges that are not constant across ping times.
-- NBP_B050N-D20180118-T090228.raw: split-beam setup without angle data
 
 
 ### AZFP