diff --git a/tests/instruments/test_drifter.py b/tests/instruments/test_drifter.py
index e239b2a6..b7e03d6b 100644
--- a/tests/instruments/test_drifter.py
+++ b/tests/instruments/test_drifter.py
@@ -29,7 +29,7 @@ def test_simulate_drifters(tmpdir: py.path.LocalPath) -> None:
             "lat": np.array([0.0, 10.0]),
             "time": [
                 np.datetime64(base_time + datetime.timedelta(seconds=0)),
-                np.datetime64(base_time + datetime.timedelta(hours=4)),
+                np.datetime64(base_time + datetime.timedelta(days=3)),
             ],
         },
     )
@@ -47,7 +47,7 @@ def test_simulate_drifters(tmpdir: py.path.LocalPath) -> None:
         Drifter(
             spacetime=Spacetime(
                 location=Location(latitude=1, longitude=1),
-                time=base_time + datetime.timedelta(hours=1),
+                time=base_time + datetime.timedelta(hours=20),
             ),
             depth=0.0,
             lifetime=None,
@@ -74,13 +74,15 @@ def test_simulate_drifters(tmpdir: py.path.LocalPath) -> None:
     for drifter_i, traj in enumerate(results.trajectory):
         # Check if drifters are moving
         # lat, lon, should be increasing values (with the above positive VU fieldset)
+        dlat = np.diff(results.sel(trajectory=traj)["lat"].values)
         assert np.all(
-            np.diff(results.sel(trajectory=traj)["lat"].values) > 0
+            dlat[np.isfinite(dlat)] > 0
         ), f"Drifter is not moving over y {drifter_i=}"
+        dlon = np.diff(results.sel(trajectory=traj)["lon"].values)
         assert np.all(
-            np.diff(results.sel(trajectory=traj)["lon"].values) > 0
-        ), f"Drifter is not mvoing over x {drifter_i=}"
-
+            dlon[np.isfinite(dlon)] > 0
+        ), f"Drifter is not moving over x {drifter_i=}"
+        temp = results.sel(trajectory=traj)["temperature"].values
         assert np.all(
-            results.sel(trajectory=traj)["temperature"] == CONST_TEMPERATURE
+            temp[np.isfinite(temp)] == CONST_TEMPERATURE
         ), f"measured temperature does not match {drifter_i=}"