diff --git a/libraries/SITL/SIM_Precland.cpp b/libraries/SITL/SIM_Precland.cpp
index 7a33909760..2875f36893 100644
--- a/libraries/SITL/SIM_Precland.cpp
+++ b/libraries/SITL/SIM_Precland.cpp
@@ -51,7 +51,7 @@ const AP_Param::GroupInfo SIM_Precland::var_info[] = {
 
     // @Param: HEIGHT
     // @DisplayName: Precland device origin's height above sealevel
-    // @Description: Precland device origin's height above sealevel
+    // @Description: Precland device origin's height above sealevel assume a 2x2m square as station base
     // @Units: cm
     // @Increment: 1
     // @Range: 0 10000
@@ -129,6 +129,8 @@ void SIM_Precland::update(const Location &loc, const Vector3f &position)
         return;
     }
     center = center * 0.01f;  // cm to m
+    _over_precland_base = origin_center.get_distance(loc) <= 2.0f;
+
     const uint32_t now = AP_HAL::millis();
     if (now - _last_update_ms < 1000.0f * (1.0f / _rate)) {
         return;
diff --git a/libraries/SITL/SIM_Precland.h b/libraries/SITL/SIM_Precland.h
index fae9e81af5..248a3d2727 100644
--- a/libraries/SITL/SIM_Precland.h
+++ b/libraries/SITL/SIM_Precland.h
@@ -50,6 +50,7 @@ public:
     AP_Int32 _rate;
     AP_Float _alt_limit;
     AP_Float _dist_limit;
+    bool _over_precland_base;
 
     enum PreclandType {
         PRECLAND_TYPE_CYLINDER = 0,