diff --git a/src/blackmisc/simulation/interpolator.cpp b/src/blackmisc/simulation/interpolator.cpp
index 6926c8d4d..ec717faf9 100644
--- a/src/blackmisc/simulation/interpolator.cpp
+++ b/src/blackmisc/simulation/interpolator.cpp
@@ -203,6 +203,7 @@ namespace BlackMisc
                 QLatin1Literal("<th>elv.old</th><th>elv.new</th><th>elv.cur</th>") %
                 QLatin1Literal("<th>gnd.factor</th>") %
                 QLatin1Literal("<th>onGnd.old</th><th>onGnd.new</th><th>onGnd.cur</th>") %
+                QLatin1Literal("<th>parts</th><th>parts details</th>") %
                 QLatin1Literal("</tr>\n");
 
             static const CLengthUnit ft = CLengthUnit::ft();
@@ -244,7 +245,11 @@ namespace BlackMisc
                     QLatin1Literal("<td>") % QString::number(log.groundFactor) % QLatin1Literal("</td>") %
                     QLatin1Literal("<td class=\"old\">") % log.oldSituation.getOnGroundInfo() % QLatin1Literal("</td>") %
                     QLatin1Literal("<td class=\"new\">") % log.newSituation.getOnGroundInfo() % QLatin1Literal("</td>") %
-                    QLatin1Literal("<td class=\"cur\">") % log.currentSituation.getOnGroundInfo() % QLatin1Literal("</td>") %
+                    QLatin1Literal("<td class=\"cur\">") % log.currentSituation.getOnGroundInfo() % QLatin1Literal("</td>");
+
+                tableRows +=
+                    QLatin1Literal("<td>") % boolToYesNo(log.useParts) % QLatin1Literal("</td>") %
+                    QLatin1Literal("<td>") % (log.useParts ? log.parts.toQString(true) : QLatin1Literal("")) % QLatin1Literal("</td>") %
                     QLatin1Literal("</tr>\n");
             }
 
diff --git a/src/blackmisc/simulation/interpolator.h b/src/blackmisc/simulation/interpolator.h
index 7c9ab257b..c038dcbcb 100644
--- a/src/blackmisc/simulation/interpolator.h
+++ b/src/blackmisc/simulation/interpolator.h
@@ -109,9 +109,9 @@ namespace BlackMisc
             //! Parts before given offset time (aka pending parts)
             //! \threadsafe
             virtual BlackMisc::Aviation::CAircraftParts getInterpolatedParts(
-                    const Aviation::CCallsign &callsign,
-                    const BlackMisc::Aviation::CAircraftPartsList &parts, qint64 cutoffTime,
-                    PartsStatus &partsStatus) const;
+                const Aviation::CCallsign &callsign,
+                const BlackMisc::Aviation::CAircraftPartsList &parts, qint64 cutoffTime,
+                PartsStatus &partsStatus) const;
 
             //! Parts before given offset time (aka pending parts)
             //! \threadsafe
@@ -149,9 +149,11 @@ namespace BlackMisc
                 double groundFactor = -1;    //!< current ground factor
                 double vtolAircraft = false; //!< VTOL aircraft
                 double deltaTimeMs = 0;      //!< delta time to last situation
-                double simulationTimeFraction = -1;      //!< time fraction, normally 0..1
-                double deltaTimeFractionMs = -1;         //!< delta time fraction
-                BlackMisc::Aviation::CCallsign callsign; //!< current callsign
+                double simulationTimeFraction = -1;        //!< time fraction, normally 0..1
+                double deltaTimeFractionMs = -1;           //!< delta time fraction
+                bool useParts = false;                     //!< supporting aircraft parts
+                BlackMisc::Aviation::CCallsign callsign;   //!< current callsign
+                BlackMisc::Aviation::CAircraftParts parts; //!< corresponding parts used in interpolator
                 BlackMisc::Aviation::CAircraftSituation oldSituation;     //!< old situation
                 BlackMisc::Aviation::CAircraftSituation newSituation;     //!< new situation
                 BlackMisc::Aviation::CAircraftSituation currentSituation; //!< interpolated situation
diff --git a/src/blackmisc/simulation/interpolatorlinear.cpp b/src/blackmisc/simulation/interpolatorlinear.cpp
index 238eebb1e..ef1f0cc25 100644
--- a/src/blackmisc/simulation/interpolatorlinear.cpp
+++ b/src/blackmisc/simulation/interpolatorlinear.cpp
@@ -107,7 +107,7 @@ namespace BlackMisc
                 IInterpolator::setGroundElevationFromHint(hints, newSituation);
             }
 
-            CAircraftSituation currentSituation(oldSituation);
+            CAircraftSituation currentSituation(oldSituation); // also sets ground elevation if available
             CCoordinateGeodetic currentPosition;
 
             // Time between start and end packet
@@ -139,7 +139,8 @@ namespace BlackMisc
             currentSituation.setPosition(currentPosition);
 
             // Interpolate altitude: Alt = (AltB - AltA) * t + AltA
-            const CAltitude oldAlt(oldSituation.getCorrectedAltitude()); // avoid underflow below ground elevation
+            // avoid underflow below ground elevation by using getCorrectedAltitude
+            const CAltitude oldAlt(oldSituation.getCorrectedAltitude());
             const CAltitude newAlt(newSituation.getCorrectedAltitude());
             Q_ASSERT_X(oldAlt.getReferenceDatum() == CAltitude::MeanSeaLevel && oldAlt.getReferenceDatum() == newAlt.getReferenceDatum(), Q_FUNC_INFO, "mismatch in reference"); // otherwise no calculation is possible
             currentSituation.setAltitude(CAltitude((newAlt - oldAlt)
@@ -222,6 +223,7 @@ namespace BlackMisc
                 log.currentSituation = currentSituation;
                 log.oldSituation = oldSituation;
                 log.newSituation = newSituation;
+                log.useParts = hints.hasAircraftParts();
                 this->logInterpolation(log);
             }