diff --git a/.gitignore b/.gitignore
index a50ae45..be736c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,9 @@ env
 /geodepy/XVSOLFIN_20220115.SNX.AUS
 /geodepy/XVSOLFIN_20220115.SNX
 /geodepy/REDX.SNX
+/geodepy/splitApref.py
+/geodepy/SNXEPO.SNX
+/geodepy/exciseStationsNGCA.py
+/geodepy/XVSOLFIN_20220326.SNX
+/geodepy/exciseStationsAPREF.py
+/geodepy/gda2020.dat
diff --git a/geodepy/gnss.py b/geodepy/gnss.py
index fdcc175..43146a8 100644
--- a/geodepy/gnss.py
+++ b/geodepy/gnss.py
@@ -7,9 +7,74 @@
 In Development
 """
 
+import sys
+from datetime import datetime
 from numpy import zeros
 from geodepy.angles import DMSAngle
-import sys
+
+
+def list_sinex_blocks(file):
+    """This script lists the blocks in a SINEX file
+
+    :param str file: the input SINEX file
+    """
+    blocks = []
+    with open(file) as f:
+        for line in f.readlines():
+            if line.startswith('+'):
+                col = line.split(' ')
+                block = col[0].replace('+', '')
+                blocks.append(block.strip())
+    for block in blocks:
+        print(block)
+
+
+def print_sinex_comments(file):
+    """This script lists prints comments in a SINEX file
+
+    :param str file: the input SINEX file
+    """
+    go = False
+    with open(file) as f:
+        for line in f.readlines():
+            if line.startswith('+FILE/COMMENT'):
+                go = True
+            if go:
+                print(line.strip())
+            if line.startswith('-FILE/COMMENT'):
+                go = False
+
+def set_creation_time():
+    """This function sets the creation time, in format YY:DDD:SSSSS, for use
+    in the SINEX header line
+
+    :return: creation_time
+    :rtype: str
+    """
+    now = datetime.now()
+    time_tup = now.timetuple()
+    year = str(time_tup.tm_year)[2:]
+    doy = time_tup.tm_yday
+    doy = '{:03d}'.format(doy)
+    seconds = (now - now.replace(hour=0, minute=0, second=0, microsecond=0))\
+        .total_seconds()
+    seconds = '{:.0f}'.format(seconds)
+    creation_time = year + ':' + doy + ':' + seconds
+
+    return creation_time
+
+
+def read_sinex_header_line(file):
+    """This function reads the header line of a SINEX file into a string
+
+    :param str file: the input SINEX file
+    :return: header_line
+    :rtype: str
+    """
+    with open(file) as f:
+        header_line = f.readline()
+
+    return header_line
 
 
 def read_sinex_estimate(file):
@@ -386,6 +451,7 @@ def read_sinex_header_block(sinex):
 
     block = []
     with open(sinex, 'r') as f:
+        line = f.readline()
         line = f.readline()
         while line:
             block.append(line)
@@ -495,13 +561,36 @@ def remove_stns_sinex(sinex, sites):
     :return: SINEX file output.snx
     """
 
+    # The block separator
     separator = '*' + '-' * 79 + '\n'
 
+    # Open the output file
     with open('output.snx', 'w') as out:
-        header = read_sinex_header_block(sinex)
-        for line in header:
-            out.write(line)
-        del header
+
+        # Get header line and update the creation time and the number of
+        # parameter estimates. Write the updated header line to the new file
+        header = read_sinex_header_line(sinex)
+        old_creation_time = header[15:27]
+        creation_time = set_creation_time()
+        header = header.replace(old_creation_time, creation_time)
+        old_num_params = int(header[60:65])
+        if header[70:71] == 'V':
+            num_stn_params = 6
+        else:
+            num_stn_params = 3
+        solution_epochs = read_sinex_solution_epochs_block(sinex)
+        num_stns_to_remove = 0
+        for line in solution_epochs:
+            site = line[1:5]
+            if site in sites:
+                num_stns_to_remove += 1
+        del solution_epochs
+        num_params = old_num_params - num_stn_params * num_stns_to_remove
+        header = header.replace(str(old_num_params), str(num_params))
+        out.write(header)
+        out.write(separator)
+
+        # Read in the site ID block and write out the sites not being removed
         site_id = read_sinex_site_id_block(sinex)
         for line in site_id:
             if line.startswith('*') or line.startswith('+') or \
@@ -513,6 +602,9 @@ def remove_stns_sinex(sinex, sites):
                     out.write(line)
         del site_id
         out.write(separator)
+
+        # Read in the solution epochs block and write out the epochs of the
+        # sites not being removed
         solution_epochs = read_sinex_solution_epochs_block(sinex)
         for line in solution_epochs:
             if line.startswith('*') or line.startswith('+') or \
@@ -524,6 +616,9 @@ def remove_stns_sinex(sinex, sites):
                     out.write(line)
         del solution_epochs
         out.write(separator)
+
+        # Read in the solution estimate block and write out the estimates of
+        # the sites not being removed
         skip = []
         estimate_number = 0
         solution_estimate = read_sinex_solution_estimate_block(sinex)
@@ -543,6 +638,9 @@ def remove_stns_sinex(sinex, sites):
                     out.write(line)
         del solution_estimate
         out.write(separator)
+
+        # Read in the matrix estimate block and write out minus the sites
+        # being removed
         vcv = {}
         solution_matrix_estimate = \
             read_sinex_solution_matrix_estimate_block(sinex)
@@ -558,7 +656,7 @@ def remove_stns_sinex(sinex, sites):
                     except KeyError:
                         vcv[row] = []
                         vcv[row].append(cols[i])
-        block_close = solution_matrix_estimate[-1]
+        block_end = solution_matrix_estimate[-1]
         del solution_matrix_estimate
         sub_vcv = {}
         sub_row = 0
@@ -584,7 +682,9 @@ def remove_stns_sinex(sinex, sites):
                     val = sub_vcv[str(i)].pop(0)
                     line += ' ' + val
                 out.write(line + '\n')
-        out.write(block_close)
+        out.write(block_end)
+
+        # Write out the trailer line
         out.write('%ENDSNX\n')
 
     return