diff --git a/gtsam/navigation/PreintegrationParams.h b/gtsam/navigation/PreintegrationParams.h
index f2b2c0fef..b929a753c 100644
--- a/gtsam/navigation/PreintegrationParams.h
+++ b/gtsam/navigation/PreintegrationParams.h
@@ -56,6 +56,7 @@ struct PreintegrationParams: PreintegratedRotationParams {
 
   const Matrix3& getAccelerometerCovariance() const { return accelerometerCovariance; }
   const Matrix3& getIntegrationCovariance()   const { return integrationCovariance; }
+  const Vector3& getGravity()   const { return n_gravity; }
   bool           getUse2ndOrderCoriolis()     const { return use2ndOrderCoriolis; }
 
 protected: