diff --git a/src/xrt/auxiliary/util/u_builders.c b/src/xrt/auxiliary/util/u_builders.c
index f89f85c1f..dd770549b 100644
--- a/src/xrt/auxiliary/util/u_builders.c
+++ b/src/xrt/auxiliary/util/u_builders.c
@@ -113,33 +113,33 @@ u_builder_setup_tracking_origins(struct xrt_device *head,
 	struct xrt_tracking_origin *right_origin = right ? right->tracking_origin : NULL;
 
 	if (left_origin != NULL && left_origin->type == XRT_TRACKING_TYPE_NONE) {
-		left_origin->offset.position.x = -0.2f;
-		left_origin->offset.position.y = 1.3f;
-		left_origin->offset.position.z = -0.5f;
+		left_origin->initial_offset.position.x = -0.2f;
+		left_origin->initial_offset.position.y = 1.3f;
+		left_origin->initial_offset.position.z = -0.5f;
 	}
 
 	if (right_origin != NULL && right_origin->type == XRT_TRACKING_TYPE_NONE) {
-		right_origin->offset.position.x = 0.2f;
-		right_origin->offset.position.y = 1.3f;
-		right_origin->offset.position.z = -0.5f;
+		right_origin->initial_offset.position.x = 0.2f;
+		right_origin->initial_offset.position.y = 1.3f;
+		right_origin->initial_offset.position.z = -0.5f;
 	}
 
 	// Head comes last, because left and right may share tracking origin.
 	if (head_origin != NULL && head_origin->type == XRT_TRACKING_TYPE_NONE) {
 		// "nominal height" 1.6m
-		head_origin->offset.position.x = 0.0f;
-		head_origin->offset.position.y = 1.6f;
-		head_origin->offset.position.z = 0.0f;
+		head_origin->initial_offset.position.x = 0.0f;
+		head_origin->initial_offset.position.y = 1.6f;
+		head_origin->initial_offset.position.z = 0.0f;
 	}
 
 	if (head_origin) {
-		apply_offset(&head_origin->offset.position, global_tracking_origin_offset);
+		apply_offset(&head_origin->initial_offset.position, global_tracking_origin_offset);
 	}
 	if (left_origin && left_origin != head_origin) {
-		apply_offset(&left->tracking_origin->offset.position, global_tracking_origin_offset);
+		apply_offset(&left->tracking_origin->initial_offset.position, global_tracking_origin_offset);
 	}
 	if (right_origin && right_origin != head_origin && right_origin != left_origin) {
-		apply_offset(&right->tracking_origin->offset.position, global_tracking_origin_offset);
+		apply_offset(&right->tracking_origin->initial_offset.position, global_tracking_origin_offset);
 	}
 }
 
diff --git a/src/xrt/auxiliary/util/u_device.c b/src/xrt/auxiliary/util/u_device.c
index 6d38edba6..7ffaeb135 100644
--- a/src/xrt/auxiliary/util/u_device.c
+++ b/src/xrt/auxiliary/util/u_device.c
@@ -316,7 +316,7 @@ u_device_allocate(enum u_device_alloc_flags flags, size_t size, size_t input_cou
 	if (alloc_tracking) {
 		xdev->tracking_origin = (struct xrt_tracking_origin *)(ptr + offset_tracking);
 		xdev->tracking_origin->type = XRT_TRACKING_TYPE_NONE;
-		xdev->tracking_origin->offset.orientation.w = 1.0f;
+		xdev->tracking_origin->initial_offset.orientation.w = 1.0f;
 		snprintf(xdev->tracking_origin->name, XRT_TRACKING_NAME_LEN, "%s", "No tracking");
 	}
 
diff --git a/src/xrt/auxiliary/util/u_space_overseer.c b/src/xrt/auxiliary/util/u_space_overseer.c
index 6e5260ac6..9c91ab859 100644
--- a/src/xrt/auxiliary/util/u_space_overseer.c
+++ b/src/xrt/auxiliary/util/u_space_overseer.c
@@ -914,7 +914,7 @@ u_space_overseer_legacy_setup(struct u_space_overseer *uso,
 		if (ptr != NULL) {
 			xs = (struct xrt_space *)ptr;
 		} else {
-			u_space_overseer_create_offset_space(uso, root, &torig->offset, &xs);
+			u_space_overseer_create_offset_space(uso, root, &torig->initial_offset, &xs);
 			u_hashmap_int_insert(torig_map, key, xs);
 		}
 
diff --git a/src/xrt/drivers/euroc/euroc_device.c b/src/xrt/drivers/euroc/euroc_device.c
index 88006a621..da1bbc70e 100644
--- a/src/xrt/drivers/euroc/euroc_device.c
+++ b/src/xrt/drivers/euroc/euroc_device.c
@@ -196,7 +196,7 @@ euroc_device_create(struct xrt_prober *xp)
 
 	xd->tracking_origin = &ed->tracking_origin;
 	xd->tracking_origin->type = XRT_TRACKING_TYPE_EXTERNAL_SLAM;
-	xd->tracking_origin->offset.orientation.w = 1.0f;
+	xd->tracking_origin->initial_offset.orientation.w = 1.0f;
 	snprintf(xd->tracking_origin->name, XRT_TRACKING_NAME_LEN, "%s %s", dev_name, "SLAM Tracker");
 
 	if (is_hmd) {
@@ -217,7 +217,7 @@ euroc_device_create(struct xrt_prober *xp)
 	u_var_add_root(ed, dev_name, false);
 	u_var_add_pose(ed, &ed->pose, "pose");
 	u_var_add_pose(ed, &ed->offset, "offset");
-	u_var_add_pose(ed, &ed->tracking_origin.offset, "tracking offset");
+	u_var_add_pose(ed, &ed->tracking_origin.initial_offset, "tracking offset");
 
 	bool tracked = xp->tracking->create_tracked_slam(xp->tracking, &ed->slam) >= 0;
 	if (!tracked) {
diff --git a/src/xrt/drivers/ht/ht_driver.c b/src/xrt/drivers/ht/ht_driver.c
index 4c4dcef16..b624f55a3 100644
--- a/src/xrt/drivers/ht/ht_driver.c
+++ b/src/xrt/drivers/ht/ht_driver.c
@@ -203,10 +203,10 @@ ht_device_create_common(struct t_stereo_camera_calibration *calib,
 	}
 
 	htd->base.tracking_origin->type = XRT_TRACKING_TYPE_RGB;
-	htd->base.tracking_origin->offset.position.x = 0.0f;
-	htd->base.tracking_origin->offset.position.y = 0.0f;
-	htd->base.tracking_origin->offset.position.z = 0.0f;
-	htd->base.tracking_origin->offset.orientation.w = 1.0f;
+	htd->base.tracking_origin->initial_offset.position.x = 0.0f;
+	htd->base.tracking_origin->initial_offset.position.y = 0.0f;
+	htd->base.tracking_origin->initial_offset.position.z = 0.0f;
+	htd->base.tracking_origin->initial_offset.orientation.w = 1.0f;
 
 	htd->base.update_inputs = u_device_noop_update_inputs;
 	htd->base.get_hand_tracking = ht_device_get_hand_tracking;
diff --git a/src/xrt/drivers/hydra/hydra_driver.c b/src/xrt/drivers/hydra/hydra_driver.c
index 5fbfa6419..6d71edca5 100644
--- a/src/xrt/drivers/hydra/hydra_driver.c
+++ b/src/xrt/drivers/hydra/hydra_driver.c
@@ -595,9 +595,9 @@ hydra_found(struct xrt_prober *xp,
 	hs->base.type = XRT_TRACKING_TYPE_HYDRA;
 	snprintf(hs->base.name, XRT_TRACKING_NAME_LEN, "%s", "Razer Hydra magnetic tracking");
 	// Arbitrary static transform from local space to base.
-	hs->base.offset.position.y = 1.0f;
-	hs->base.offset.position.z = -0.25f;
-	hs->base.offset.orientation.w = 1.0f;
+	hs->base.initial_offset.position.y = 1.0f;
+	hs->base.initial_offset.position.z = -0.25f;
+	hs->base.initial_offset.orientation.w = 1.0f;
 
 	hs->data_hid = data_hid;
 	hs->command_hid = command_hid;
diff --git a/src/xrt/drivers/multi_wrapper/multi.c b/src/xrt/drivers/multi_wrapper/multi.c
index 0eef63de6..b4e303d90 100644
--- a/src/xrt/drivers/multi_wrapper/multi.c
+++ b/src/xrt/drivers/multi_wrapper/multi.c
@@ -109,8 +109,8 @@ get_tracked_pose(struct xrt_device *xdev,
 		m_space_relation_ident(&in_target_space);
 		in_target_space.relation_flags = tracker_relation.relation_flags;
 
-		struct xrt_pose *target_offset = &d->tracking_override.target->tracking_origin->offset;
-		struct xrt_pose *tracker_offset = &d->tracking_override.tracker->tracking_origin->offset;
+		struct xrt_pose *target_offset = &d->tracking_override.target->tracking_origin->initial_offset;
+		struct xrt_pose *tracker_offset = &d->tracking_override.tracker->tracking_origin->initial_offset;
 
 		attached_override(d, &target_relation, target_offset, &tracker_relation, tracker_offset,
 		                  &in_target_space, out_relation);
@@ -163,8 +163,8 @@ get_hand_tracking(struct xrt_device *xdev,
 		m_space_relation_ident(&in_target_space);
 		in_target_space.relation_flags = tracker_relation.relation_flags;
 
-		struct xrt_pose *target_offset = &d->tracking_override.target->tracking_origin->offset;
-		struct xrt_pose *tracker_offset = &d->tracking_override.tracker->tracking_origin->offset;
+		struct xrt_pose *target_offset = &d->tracking_override.target->tracking_origin->initial_offset;
+		struct xrt_pose *tracker_offset = &d->tracking_override.tracker->tracking_origin->initial_offset;
 
 		attached_override(d, &out_value->hand_pose, target_offset, &tracker_relation, tracker_offset,
 		                  &in_target_space, &out_value->hand_pose);
diff --git a/src/xrt/drivers/ohmd/oh_device.c b/src/xrt/drivers/ohmd/oh_device.c
index 72c7e3ef7..121999cde 100644
--- a/src/xrt/drivers/ohmd/oh_device.c
+++ b/src/xrt/drivers/ohmd/oh_device.c
@@ -1233,7 +1233,7 @@ oh_device_create(ohmd_context *ctx, bool no_hmds, struct xrt_device **out_xdevs)
 	//! @todo: support mix of 3dof and 6dof OpenHMD devices
 	struct oh_system *sys = U_TYPED_CALLOC(struct oh_system);
 	sys->base.type = XRT_TRACKING_TYPE_NONE;
-	sys->base.offset.orientation.w = 1.0f;
+	sys->base.initial_offset.orientation.w = 1.0f;
 
 	u_var_add_root(sys, "OpenHMD Wrapper", false);
 
diff --git a/src/xrt/drivers/realsense/rs_ddev.c b/src/xrt/drivers/realsense/rs_ddev.c
index ebb737596..4d7e562bf 100644
--- a/src/xrt/drivers/realsense/rs_ddev.c
+++ b/src/xrt/drivers/realsense/rs_ddev.c
@@ -466,7 +466,7 @@ rs_ddev_create(int device_idx)
 	rs->base.destroy = rs_ddev_destroy;
 	rs->base.name = XRT_DEVICE_REALSENSE;
 	rs->base.tracking_origin->type = XRT_TRACKING_TYPE_EXTERNAL_SLAM;
-	rs->base.tracking_origin->offset = (struct xrt_pose)XRT_POSE_IDENTITY;
+	rs->base.tracking_origin->initial_offset = (struct xrt_pose)XRT_POSE_IDENTITY;
 
 	// Print name.
 	snprintf(rs->base.str, XRT_DEVICE_NAME_LEN, "Intel RealSense Device-SLAM");
diff --git a/src/xrt/drivers/remote/r_hub.c b/src/xrt/drivers/remote/r_hub.c
index aaaf0b3c0..f72e06a76 100644
--- a/src/xrt/drivers/remote/r_hub.c
+++ b/src/xrt/drivers/remote/r_hub.c
@@ -415,7 +415,7 @@ r_create_devices(uint16_t port,
 	r->base.destroy = r_hub_system_devices_destroy;
 	r->base.get_roles = r_hub_system_devices_get_roles;
 	r->origin.type = XRT_TRACKING_TYPE_RGB;
-	r->origin.offset = (struct xrt_pose)XRT_POSE_IDENTITY;
+	r->origin.initial_offset = (struct xrt_pose)XRT_POSE_IDENTITY;
 	r->reset.head.center = (struct xrt_pose)XRT_POSE_IDENTITY;
 	r->reset.head.center.position.y = 1.6f;
 	r->reset.left.active = true;
@@ -487,7 +487,7 @@ r_create_devices(uint16_t port,
 
 	struct xrt_space *root = xso->semantic.root; // Convenience
 	struct xrt_space *offset = NULL;
-	u_space_overseer_create_offset_space(uso, root, &r->origin.offset, &offset);
+	u_space_overseer_create_offset_space(uso, root, &r->origin.initial_offset, &offset);
 
 	for (uint32_t i = 0; i < r->base.xdev_count; i++) {
 		u_space_overseer_link_space_to_device(uso, offset, r->base.xdevs[i]);
diff --git a/src/xrt/drivers/rift_s/rift_s.c b/src/xrt/drivers/rift_s/rift_s.c
index 217e7a61a..71e918780 100644
--- a/src/xrt/drivers/rift_s/rift_s.c
+++ b/src/xrt/drivers/rift_s/rift_s.c
@@ -158,7 +158,7 @@ rift_s_system_create(struct xrt_prober *xp,
 
 	struct rift_s_system *sys = U_TYPED_CALLOC(struct rift_s_system);
 	sys->base.type = XRT_TRACKING_TYPE_NONE;
-	sys->base.offset.orientation.w = 1.0f;
+	sys->base.initial_offset.orientation.w = 1.0f;
 
 	/* Init refcount */
 	sys->ref.count = 1;
diff --git a/src/xrt/drivers/steamvr_lh/steamvr_lh.cpp b/src/xrt/drivers/steamvr_lh/steamvr_lh.cpp
index d35c08d20..16175ab07 100644
--- a/src/xrt/drivers/steamvr_lh/steamvr_lh.cpp
+++ b/src/xrt/drivers/steamvr_lh/steamvr_lh.cpp
@@ -115,7 +115,7 @@ Context::create(const std::string &steam_install,
 	c->providers = std::move(providers);
 	std::strncpy(c->name, "SteamVR Lighthouse Tracking", XRT_TRACKING_NAME_LEN);
 	c->type = XRT_TRACKING_TYPE_LIGHTHOUSE;
-	c->offset = XRT_POSE_IDENTITY;
+	c->initial_offset = XRT_POSE_IDENTITY;
 	for (vr::IServerTrackedDeviceProvider *const &driver : c->providers) {
 		vr::EVRInitError err = driver->Init(c.get());
 		if (err != vr::VRInitError_None) {
diff --git a/src/xrt/drivers/survive/survive_driver.c b/src/xrt/drivers/survive/survive_driver.c
index 52f067266..53294e650 100644
--- a/src/xrt/drivers/survive/survive_driver.c
+++ b/src/xrt/drivers/survive/survive_driver.c
@@ -1336,10 +1336,10 @@ survive_get_devices(struct xrt_device **out_xdevs, struct vive_config **out_vive
 	ss->ctx = actx;
 	ss->base.type = XRT_TRACKING_TYPE_LIGHTHOUSE;
 	snprintf(ss->base.name, XRT_TRACKING_NAME_LEN, "%s", "Libsurvive Tracking");
-	ss->base.offset.position.x = 0.0f;
-	ss->base.offset.position.y = 0.0f;
-	ss->base.offset.position.z = 0.0f;
-	ss->base.offset.orientation.w = 1.0f;
+	ss->base.initial_offset.position.x = 0.0f;
+	ss->base.initial_offset.position.y = 0.0f;
+	ss->base.initial_offset.position.z = 0.0f;
+	ss->base.initial_offset.orientation.w = 1.0f;
 	ss->timecode_offset_ms = (struct u_var_draggable_f32){
 	    .val = debug_get_float_option_survive_timecode_offset_ms(),
 	    .min = -20.0,
diff --git a/src/xrt/drivers/twrap/twrap_slam.c b/src/xrt/drivers/twrap/twrap_slam.c
index e2d43fa85..55efbc02b 100644
--- a/src/xrt/drivers/twrap/twrap_slam.c
+++ b/src/xrt/drivers/twrap/twrap_slam.c
@@ -176,7 +176,7 @@ twrap_slam_create_device(struct xrt_frame_context *xfctx,
 	dx->base.destroy = twrap_slam_destroy;
 	dx->base.name = name;
 	dx->base.tracking_origin->type = XRT_TRACKING_TYPE_OTHER;
-	dx->base.tracking_origin->offset = (struct xrt_pose)XRT_POSE_IDENTITY;
+	dx->base.tracking_origin->initial_offset = (struct xrt_pose)XRT_POSE_IDENTITY;
 	dx->base.inputs[0].name = XRT_INPUT_GENERIC_TRACKER_POSE;
 	dx->base.orientation_tracking_supported = true;
 	dx->base.position_tracking_supported = true;
diff --git a/src/xrt/drivers/ultraleap_v2/ulv2_driver.cpp b/src/xrt/drivers/ultraleap_v2/ulv2_driver.cpp
index 237b3d61e..5d368e445 100644
--- a/src/xrt/drivers/ultraleap_v2/ulv2_driver.cpp
+++ b/src/xrt/drivers/ultraleap_v2/ulv2_driver.cpp
@@ -387,7 +387,7 @@ ulv2_create_device(struct xrt_device **out_xdev)
 	ulv2d->base.tracking_origin = &ulv2d->tracking_origin;
 	ulv2d->base.tracking_origin->type = XRT_TRACKING_TYPE_OTHER;
 
-	math_pose_identity(&ulv2d->base.tracking_origin->offset);
+	math_pose_identity(&ulv2d->base.tracking_origin->initial_offset);
 
 	ulv2d->log_level = debug_get_log_option_ulv2_log();
 
diff --git a/src/xrt/drivers/ultraleap_v5/ulv5_driver.cpp b/src/xrt/drivers/ultraleap_v5/ulv5_driver.cpp
index d3928123f..8d2454a1c 100644
--- a/src/xrt/drivers/ultraleap_v5/ulv5_driver.cpp
+++ b/src/xrt/drivers/ultraleap_v5/ulv5_driver.cpp
@@ -310,7 +310,7 @@ ulv5_create_device(struct xrt_device **out_xdev)
 	ulv5d->base.tracking_origin = &ulv5d->tracking_origin;
 	ulv5d->base.tracking_origin->type = XRT_TRACKING_TYPE_OTHER;
 
-	math_pose_identity(&ulv5d->base.tracking_origin->offset);
+	math_pose_identity(&ulv5d->base.tracking_origin->initial_offset);
 
 	ulv5d->log_level = debug_get_log_option_ulv5_log();
 
diff --git a/src/xrt/include/xrt/xrt_tracking.h b/src/xrt/include/xrt/xrt_tracking.h
index b63b245f3..e7fec33bd 100644
--- a/src/xrt/include/xrt/xrt_tracking.h
+++ b/src/xrt/include/xrt/xrt_tracking.h
@@ -76,10 +76,10 @@ struct xrt_tracking_origin
 	enum xrt_tracking_type type;
 
 	/*!
-	 * Read and written to by the state-tracker using the device(s)
-	 * this tracking system is tracking.
+	 * Read-only. Set once by the builder, or in some cases, the driver.
+	 * With some systems, the offset may be changed at runtime using the space overseer.
 	 */
-	struct xrt_pose offset;
+	struct xrt_pose initial_offset;
 };
 
 /*!
diff --git a/src/xrt/ipc/client/ipc_client_instance.c b/src/xrt/ipc/client/ipc_client_instance.c
index cb635306d..b79ed653a 100644
--- a/src/xrt/ipc/client/ipc_client_instance.c
+++ b/src/xrt/ipc/client/ipc_client_instance.c
@@ -283,12 +283,12 @@ ipc_instance_create(struct xrt_instance_info *i_info, struct xrt_instance **out_
 		memcpy(xtrack->name, ism->itracks[i].name, sizeof(xtrack->name));
 
 		xtrack->type = ism->itracks[i].type;
-		xtrack->offset = ism->itracks[i].offset;
+		xtrack->initial_offset = ism->itracks[i].offset;
 		ii->xtracks[count++] = xtrack;
 
 		u_var_add_root(xtrack, "Tracking origin", true);
 		u_var_add_ro_text(xtrack, xtrack->name, "name");
-		u_var_add_pose(xtrack, &xtrack->offset, "offset");
+		u_var_add_pose(xtrack, &xtrack->initial_offset, "offset");
 	}
 
 	ii->xtrack_count = count;
diff --git a/src/xrt/ipc/server/ipc_server_process.c b/src/xrt/ipc/server/ipc_server_process.c
index e09e76bed..cfcfa1419 100644
--- a/src/xrt/ipc/server/ipc_server_process.c
+++ b/src/xrt/ipc/server/ipc_server_process.c
@@ -322,7 +322,7 @@ init_shm(struct ipc_server *s)
 		struct ipc_shared_tracking_origin *itrack = &ism->itracks[count++];
 		memcpy(itrack->name, xtrack->name, sizeof(itrack->name));
 		itrack->type = xtrack->type;
-		itrack->offset = xtrack->offset;
+		itrack->offset = xtrack->initial_offset;
 	}
 
 	ism->itrack_count = count;
diff --git a/src/xrt/state_trackers/oxr/oxr_session_frame_end.c b/src/xrt/state_trackers/oxr/oxr_session_frame_end.c
index 10523e33f..843337abb 100644
--- a/src/xrt/state_trackers/oxr/oxr_session_frame_end.c
+++ b/src/xrt/state_trackers/oxr/oxr_session_frame_end.c
@@ -1789,7 +1789,7 @@ oxr_session_frame_end(struct oxr_logger *log, struct oxr_session *sess, const Xr
 	do_synchronize_state_change(log, sess);
 
 	struct xrt_pose inv_offset = {0};
-	math_pose_invert(&xdev->tracking_origin->offset, &inv_offset);
+	math_pose_invert(&xdev->tracking_origin->initial_offset, &inv_offset);
 
 	struct xrt_layer_frame_data data = {
 	    .frame_id = sess->frame_id.begun,
diff --git a/src/xrt/state_trackers/prober/p_tracking.c b/src/xrt/state_trackers/prober/p_tracking.c
index bb6c0959a..009a3cd4e 100644
--- a/src/xrt/state_trackers/prober/p_tracking.c
+++ b/src/xrt/state_trackers/prober/p_tracking.c
@@ -421,15 +421,15 @@ p_tracking_init(struct prober *p)
 	fact->base.create_tracked_psvr = p_factory_create_tracked_psvr;
 	fact->base.create_tracked_slam = p_factory_create_tracked_slam;
 	fact->origin.type = XRT_TRACKING_TYPE_RGB;
-	fact->origin.offset.orientation.y = 1.0f;
-	fact->origin.offset.position.z = -2.0f;
-	fact->origin.offset.position.y = 1.0f;
+	fact->origin.initial_offset.orientation.y = 1.0f;
+	fact->origin.initial_offset.position.z = -2.0f;
+	fact->origin.initial_offset.position.y = 1.0f;
 	fact->p = p;
 
 	snprintf(fact->origin.name, sizeof(fact->origin.name), "PSVR & PSMV tracking");
 
 	u_var_add_root(fact, "Tracking Factory", false);
-	u_var_add_pose(fact, &fact->origin.offset, "offset");
+	u_var_add_pose(fact, &fact->origin.initial_offset, "offset");
 
 	// Finally set us as the tracking factory.
 	p->base.tracking = &fact->base;
diff --git a/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp b/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
index 451135c9d..5d9b07884 100644
--- a/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
+++ b/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp
@@ -881,7 +881,7 @@ public:
 		struct xrt_space_relation rel;
 		xrt_device_get_tracked_pose(m_xdev, grip_name, now_ns, &rel);
 
-		struct xrt_pose *offset = &m_xdev->tracking_origin->offset;
+		struct xrt_pose *offset = &m_xdev->tracking_origin->initial_offset;
 
 		struct xrt_relation_chain chain = {};
 		m_relation_chain_push_relation(&chain, &rel);
@@ -1268,7 +1268,7 @@ CDeviceDriver_Monado::GetPose()
 	struct xrt_space_relation rel;
 	xrt_device_get_tracked_pose(m_xdev, XRT_INPUT_GENERIC_HEAD_POSE, now_ns, &rel);
 
-	struct xrt_pose *offset = &m_xdev->tracking_origin->offset;
+	struct xrt_pose *offset = &m_xdev->tracking_origin->initial_offset;
 
 	struct xrt_relation_chain chain = {};
 	m_relation_chain_push_relation(&chain, &rel);
diff --git a/src/xrt/targets/common/target_builder_rgb_tracking.c b/src/xrt/targets/common/target_builder_rgb_tracking.c
index 60b7cacb8..41ed2faf5 100644
--- a/src/xrt/targets/common/target_builder_rgb_tracking.c
+++ b/src/xrt/targets/common/target_builder_rgb_tracking.c
@@ -301,9 +301,9 @@ rgb_open_system_impl(struct xrt_builder *xb,
 		build.xfctx = xfctx;
 		build.origin = origin;
 		build.origin->type = XRT_TRACKING_TYPE_RGB;
-		build.origin->offset.orientation.y = 1.0f;
-		build.origin->offset.position.z = -2.0f;
-		build.origin->offset.position.y = 1.0f;
+		build.origin->initial_offset.orientation.y = 1.0f;
+		build.origin->initial_offset.position.z = -2.0f;
+		build.origin->initial_offset.position.y = 1.0f;
 
 		setup_pipeline(xp, &build);
 #else
diff --git a/src/xrt/targets/sdl_test/sdl_device.c b/src/xrt/targets/sdl_test/sdl_device.c
index 2e7b20b90..210887af8 100644
--- a/src/xrt/targets/sdl_test/sdl_device.c
+++ b/src/xrt/targets/sdl_test/sdl_device.c
@@ -120,7 +120,7 @@ sdl_device_init(struct sdl_program *sp)
 	u_distortion_mesh_set_none(xdev);
 
 	// Tracking origin.
-	xdev->tracking_origin->offset = (struct xrt_pose)XRT_POSE_IDENTITY;
+	xdev->tracking_origin->initial_offset = (struct xrt_pose)XRT_POSE_IDENTITY;
 	xdev->tracking_origin->type = XRT_TRACKING_TYPE_OTHER;
 	snprintf(xdev->tracking_origin->name, XRT_TRACKING_NAME_LEN, "SDL Tracking");
 }