diff --git a/libraries/AP_Mount/AP_Mount_Backend.h b/libraries/AP_Mount/AP_Mount_Backend.h
index 39a784ddb5..07ccd09663 100644
--- a/libraries/AP_Mount/AP_Mount_Backend.h
+++ b/libraries/AP_Mount/AP_Mount_Backend.h
@@ -244,6 +244,14 @@ protected:
     };
     bool option_set(Options opt) const { return (_params.options.get() & (uint8_t)opt) != 0; }
 
+    // returns true if user has configured a valid roll angle range
+    // allows user to disable roll even on 3-axis gimbal
+    bool roll_range_valid() const { return (_params.roll_angle_min < _params.roll_angle_max); }
+
+    // returns true if user has configured a valid pitch angle range
+    // allows user to disable pitch even on 3-axis gimbal
+    bool pitch_range_valid() const { return (_params.pitch_angle_min < _params.pitch_angle_max); }
+
     // returns true if user has configured a valid yaw angle range
     // allows user to disable yaw even on 3-axis gimbal
     bool yaw_range_valid() const { return (_params.yaw_angle_min < _params.yaw_angle_max); }