diff --git a/src/ifcbimtester/bimtester/features/steps/geolocation/en.py b/src/ifcbimtester/bimtester/features/steps/geolocation/en.py
index 596aa858cf..13aa359671 100644
--- a/src/ifcbimtester/bimtester/features/steps/geolocation/en.py
+++ b/src/ifcbimtester/bimtester/features/steps/geolocation/en.py
@@ -234,7 +234,7 @@ def step_impl(context, guid, number):
     site = util.assert_guid(IfcStore.file, guid)
     util.assert_type(site, "IfcSite")
     ref = util.assert_attribute(site, "RefLongitude")
-    number = ifcopenshell.util.geolocation.dd2dms(number, use_ms=(len(ref) == 4))
+    number = ifcopenshell.util.geolocation.dd2dms(number, use_us=(len(ref) == 4))
     util.assert_attribute(site, "RefLongitude", number)
 
 
@@ -244,7 +244,7 @@ def step_impl(context, guid, number):
     site = util.assert_guid(IfcStore.file, guid)
     util.assert_type(site, "IfcSite")
     ref = util.assert_attribute(site, "RefLatitude")
-    number = ifcopenshell.util.geolocation.dd2dms(number, use_ms=(len(ref) == 4))
+    number = ifcopenshell.util.geolocation.dd2dms(number, use_us=(len(ref) == 4))
     util.assert_attribute(site, "RefLatitude", number)
 
 
diff --git a/src/ifcopenshell-python/ifcopenshell/util/geolocation.py b/src/ifcopenshell-python/ifcopenshell/util/geolocation.py
index 2855bfde5c..45ae344bca 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/geolocation.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/geolocation.py
@@ -23,6 +23,7 @@ import ifcopenshell.util.unit
 import ifcopenshell.util.element
 import ifcopenshell.util.placement
 from typing import NamedTuple, Optional, Union
+from decimal import Decimal, ROUND_HALF_UP
 
 MatrixType = ifcopenshell.util.placement.MatrixType
 
@@ -39,39 +40,54 @@ class HelmertTransformation(NamedTuple):
     factor_z: float
 
 
-def dms2dd(degrees: int, minutes: int, seconds: int, ms: int = 0) -> float:
-    """Convert degrees, minutes, and (milli)seconds to decimal degrees
+def dms2dd(degrees: int, minutes: int, seconds: int, us: int = 0) -> float:
+    """Convert degrees, minutes, and (micro)seconds to decimal degrees
+    All components must be either positive or negative.
 
     :param degrees: The degrees component
     :param minutes: The minutes component
     :param seconds: The seconds component
-    :param ms: The milliseconds component
+    :param us: The microseconds component
     :return: The angle in decimal degrees.
     """
-    dd = float(degrees) + float(minutes) / 60.0 + float(seconds) / (3600.0) + float(ms / 3600000000.0)
-    return dd
+    all_positive_or_zero = degrees >= 0 and minutes >= 0 and seconds >= 0 and us >= 0
+    all_negative_or_zero = degrees <= 0 and minutes <= 0 and seconds <= 0 and us <= 0
+    assert all_positive_or_zero or all_negative_or_zero
+    return degrees + minutes / 60.0 + seconds / 3600.0 + us / 3600000000.0
 
 
-def dd2dms(dd: float, use_ms: bool = False) -> Union[tuple[float, float, float, float], tuple[float, float, float]]:
-    """Convert decimal degrees to degrees, minutes, and (milli)seconds format
+def dd2dms(dd: float, use_us: bool = False) -> Union[tuple[int, int, int, int], tuple[int, int, float]]:
+    """Convert decimal degrees to degrees, minutes, and (micro)seconds format
 
     :param dd: The decimal degrees
-    :param use_ms: True if to include milliseconds and false otherwise. Defaults to false.
-    :return: The angle in a tuple of either 3 or 4 values, being degrees,
-        minutes, seconds, and optionally milliseconds.
+    :param use_us: True if to include microseconds and false otherwise. Defaults to false.
+    :return: The angle in a tuple of either 3 or 4 values,
+        4 values: integer number of degrees, integer number of minutes, integer number of seconds and integer number of microseconds
+        3 values: integer number of degrees, integer number of minutes, and a float number for seconds
+    :note: the tuple follows the format of IfcCompoundPlaneAngleMeasure. Namely all of its components are either positive or negative.
     """
-    dd = float(dd)
-    sign = 1 if dd >= 0 else -1
-    dd = abs(dd)
-    if use_ms:
-        seconds, ms = divmod(dd * 60 * 60 * 1000000, 1000000)
-    minutes, seconds = divmod(dd * 60 * 60, 60)
-    degrees, minutes = divmod(minutes, 60)
-    if dd < 0:
-        degrees = -degrees
-    if use_ms:
-        return (int(degrees) * sign, int(minutes) * sign, int(seconds) * sign, int(ms) * sign)
-    return (int(degrees) * sign, int(minutes) * sign, int(seconds) * sign)
+    dd_decimal = Decimal(str(dd))
+
+    degrees = int(dd_decimal)
+    degrees_decimal = Decimal(degrees)
+
+    fractional_part = dd_decimal - degrees_decimal
+
+    minutes_decimal = fractional_part * Decimal(60)
+    minutes = int(minutes_decimal)
+    minutes_decimal_int = Decimal(minutes)
+
+    seconds_decimal = (minutes_decimal - minutes_decimal_int) * Decimal(60)
+
+    if use_us:
+        seconds = int(seconds_decimal)
+        seconds_decimal_int = Decimal(seconds)
+        microseconds_decimal = (seconds_decimal - seconds_decimal_int) * Decimal(1000000)
+        microseconds = int(microseconds_decimal.quantize(Decimal(1), rounding=ROUND_HALF_UP))
+        return (degrees, minutes, seconds, microseconds)
+    else:
+        seconds_float = float(seconds_decimal)
+        return (degrees, minutes, seconds_float)
 
 
 def xyz2enh(
diff --git a/src/ifcopenshell-python/test/util/test_geolocation.py b/src/ifcopenshell-python/test/util/test_geolocation.py
index 532f971b42..59f70fcd7a 100644
--- a/src/ifcopenshell-python/test/util/test_geolocation.py
+++ b/src/ifcopenshell-python/test/util/test_geolocation.py
@@ -468,3 +468,29 @@ class TestAngle2YAxis(test.bootstrap.IFC4):
         assert np.allclose(subject.angle2yaxis(45), (-a, a))
         assert np.allclose(subject.angle2yaxis(-135), (a, -a))
         assert np.allclose(subject.angle2yaxis(135), (-a, -a))
+
+
+class TestDMS2DDandDD2DMS(test.bootstrap.IFC4):
+    def test_dms2dd_and_dd2dms(self):
+        test_cases_3tuple = [
+            (35.41, (35, 24, 36.0)),
+            (-116.89, (-116, -53, -24.0)),
+        ]
+        test_cases_4tuple = [
+            (40.431389, (40, 25, 53, 400)),
+            (-4.248056, (-4, -14, -53, -1600)),
+            (-35.401389, (-35, -24, -5, -400)),
+            (148.981667, (148, 58, 54, 1200)),
+        ]
+
+        for dd, dms in test_cases_3tuple:
+            d, m, s = subject.dd2dms(dd)
+            assert (d, m, s) == dms
+            dd_converted = subject.dms2dd(dms[0], dms[1], dms[2])
+            assert dd_converted == dd
+
+        for dd, dms in test_cases_4tuple:
+            d, m, s, us = subject.dd2dms(dd, use_us=True)
+            assert (d, m, s, us) == dms
+            dd_converted = subject.dms2dd(dms[0], dms[1], dms[2], dms[3])
+            assert dd_converted == dd