diff --git a/core/include/detray/navigation/detail/navigation_functions.hpp b/core/include/detray/navigation/detail/navigation_functions.hpp
index 788890995..59e5c8de9 100644
--- a/core/include/detray/navigation/detail/navigation_functions.hpp
+++ b/core/include/detray/navigation/detail/navigation_functions.hpp
@@ -200,7 +200,8 @@ DETRAY_HOST_DEVICE DETRAY_INLINE constexpr void local_navigation(
                                navigation.volume());
 
     // Do not resurrect a failed/finished navigation state
-    assert(navigation.is_alive());
+    assert(navigation.is_alive() ||
+           navigation.status() == navigation::status::e_unknown);
     assert(!track.is_invalid());
 
     const auto &det = navigation.detector();
@@ -231,7 +232,7 @@ DETRAY_HOST_DEVICE DETRAY_INLINE constexpr void local_navigation(
         // Do not exit if backward navigation starts on the outmost portal
         if (navigation.is_on_portal()) {
             DETRAY_DEBUG_HOST_DEVICE(
-                "-> Adjust trust lvl for \"end-of-world\"...");
+                "-> Adjust trust lvl for possible \"end-of-world\"...");
             navigation.trust_level(detray::detail::is_invalid_value(
                                        navigation.current().volume_link())
                                        ? navigation::trust_level::e_full
diff --git a/core/include/detray/navigation/navigation_state.hpp b/core/include/detray/navigation/navigation_state.hpp
index f282db627..27441c07d 100644
--- a/core/include/detray/navigation/navigation_state.hpp
+++ b/core/include/detray/navigation/navigation_state.hpp
@@ -170,7 +170,7 @@ class base_state : public detray::ranges::view_interface<
     /// @returns the navigation heartbeat (is this stream still being updated?)
     DETRAY_HOST_DEVICE
     constexpr bool is_alive() const {
-        return cast_impl().status() > navigation::status::e_exit;
+        return cast_impl().status() > navigation::status::e_unknown;
     }
 
     /// @returns current navigation direction - const
diff --git a/core/include/detray/propagator/propagator.hpp b/core/include/detray/propagator/propagator.hpp
index e76c6ddde..1f357e04c 100644
--- a/core/include/detray/propagator/propagator.hpp
+++ b/core/include/detray/propagator/propagator.hpp
@@ -271,12 +271,17 @@ struct propagator {
 
         DETRAY_VERBOSE_HOST("Starting propagation for track:\n" << track);
 
-        // Initialize the navigation
-        DETRAY_VERBOSE_HOST("Initialize navigation...");
-        m_navigator.init(track, navigation, m_cfg.navigation, context);
-        propagation.heartbeat(navigation.is_alive());
+        bool is_init = false;
+        if (this->is_paused(propagation)) {
+            DETRAY_VERBOSE_HOST("Resuming propagation...");
+        } else {
+            // Initialize the navigation
+            DETRAY_VERBOSE_HOST("Initialize navigation...");
+            m_navigator.init(track, navigation, m_cfg.navigation, context);
+            propagation.heartbeat(navigation.is_alive());
 
-        bool is_init = true;
+            is_init = true;
+        }
 
         // Run while there is a heartbeat. In order to help the compiler
         // optimize this, and in order to make the code more GPU-friendly,