diff --git a/src/aare/daq/operations/raster/service.py b/src/aare/daq/operations/raster/service.py
index 02561827..3e83a929 100644
--- a/src/aare/daq/operations/raster/service.py
+++ b/src/aare/daq/operations/raster/service.py
@@ -383,6 +383,7 @@ class RasterService:
                 )
                 com = raster_centre_of_mass(result_array, scan_result.images)
                 if com is None:
+                    self.logger.info("Calcualted COM is None using centre image")
                     if request.n_x == 1:
                         x = request.grid_size_mm.x / 2.0
                     else:
@@ -409,8 +410,27 @@ class RasterService:
                         ),
                     )
                 else:
+                    self.logger.info("Calcualted COM is not None, procedding")
                     target_coor = com.get_com_mm(request)
                     target_coor_offset = self.ctx.sample_geometry.smargon_nudge(target_coor)
+                    self.logger.info(
+                        "Calculated raster centre offset",
+                        extra=merge_log_context(
+                            sample_log_context(self.ctx.sample),
+                            raster_request_log_context(request),
+                            {
+                                "centre_offset_x_mm": target_coor_offset.x,
+                                "centre_offset_y_mm": target_coor_offset.y,
+                                "centre_offset_z_mm": target_coor_offset.z,
+                                "grid_half_width_x_mm": x,
+                                "grid_half_height_y_mm": y,
+                                "top_left_x_mm": getattr(request.smargon_top_left.sh_mm, "x", None),
+                                "top_left_y_mm": getattr(request.smargon_top_left.sh_mm, "y", None),
+                                "top_left_z_mm": getattr(request.smargon_top_left.sh_mm, "z", None),
+                            },
+                        ),
+                    )
+
 
                 self.logger.info(f"moving Smargon to grid centre offset {target_coor_offset}")
                 target_smargon = SmargonCoordinate(