diff --git a/params/ardupilot/ArduSub/4.5/base.params b/params/ardupilot/ArduSub/4.5/base.params
index 2e5fe68..0917297 100644
--- a/params/ardupilot/ArduSub/4.5/base.params
+++ b/params/ardupilot/ArduSub/4.5/base.params
@@ -4,3 +4,6 @@ AHRS_ORIENTATION: 16,
 BRD_RTC_TYPES: 3,
 MNT1_TYPE: 1,
 SERIAL0_PROTOCOL: 2, // MAVLink2
+MNT1_PITCH_MAX: 45,
+MNT1_PITCH_MIN: -45,
+RNGFND1_TYPE: 10,