diff --git a/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php b/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
index 5cb49be..285619f 100644
--- a/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
+++ b/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
@@ -1457,8 +1457,10 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 				return $this->unmarshallZoom($actionInput, $plotInput);
 			case 'forward':
 			case 'halfforward':
+			case 'quarterforward':
 			case 'backward':
 			case 'halfbackward':
+			case 'quarterbackward':
 			case 'extend':
 			case 'shift':
 				return $this->unmarshallNavigation($actionInput, $plotInput);
@@ -1651,6 +1653,10 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 				$startTimeStamp += ($duration / 2);
 				$stopTimeStamp  += ($duration / 2);
 				break;
+			case 'quarterforward':
+				$startTimeStamp += ($duration / 4);
+				$stopTimeStamp  += ($duration / 4);
+				break;
 			case 'backward':
 				$startTimeStamp -= $duration;
 				$stopTimeStamp  -= $duration;
@@ -1659,6 +1665,10 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 				$startTimeStamp -= ($duration / 2);
 				$stopTimeStamp  -= ($duration / 2);
 				break;
+			case 'quarterbackward':
+				$startTimeStamp -= ($duration / 4);
+				$stopTimeStamp  -= ($duration / 4);
+				break;
 			case 'extend':
 				$startTimeStamp -= $input->{'duration'};
 				$stopTimeStamp  += $input->{'duration'};
--
libgit2 0.21.2