Rover (Boat) in SITL

Good Morning,
Im Doing my internship at U2IS and the goal is to simulate with gazebo a boat.
I have multiple questions, such as:
What is the purpose of the rate message that is printed constantly printed on the Screen “Rover”?
What number is the frame for a boat with one thruster and one rudder?

these are the parameters that I’m loading, but the motors in the simulation don’t respond accordingly
FRAME_CLASS 2
PILOT_STEER_TYPE 0
FRAME_TYPE 0
CRUISE_THROTTLE 50
SERVO1_FUNCTION 70
SERVO3_FUNCTION 26
STICK_MIXINN 1
AFS_ENABLE 0
AHRS_GPS_GAIN 0
ARMING_REQUIRE 1
ARMING_CHECK 1
MOT_VEC_THR_BASE 20
INITIAL_MODE 0
TURN_RADIUS 4
RC1_MAX 2000
RC1_MIN 1000
RC1_TRIM 1500
RC3_MAX 2000
RC3_MIN 1000
RC3_TRIM 1500
SERVO1_MIN 1000
SERVO1_MAX 2000
SERVO3_MAX 2000
SERVO3_MIN 1000

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