Add boat(usv) sitl target

ROMFS/px4fmu_common/init.d/rc.boat_defaults

@@ -0,0 +1,42 @@
+#!/bin/sh
+#
+# UGV default parameters.
+#
+# NOTE: Script variables are declared/initialized/unset in the rcS script.
+#
+
+set VEHICLE_TYPE rover
+
+if [ $AUTOCNF = yes ]
+then
+#
+# Default parameters for UGVs.
+#
+	param set MIS_LTRMIN_ALT 0.01
+	param set MIS_TAKEOFF_ALT 0.01
+
+	param set NAV_DLL_ACT 0
+	param set NAV_ACC_RAD 2
+
+	# Temporary.
+	param set NAV_FW_ALT_RAD 1000
+fi
+
+#
+# Enable servo output on pins 3 and 4 (steering and thrust)
+# but also include 1+2 as they form together one output group
+# and need to be set together.
+#
+set PWM_OUT 1234
+
+#
+# PWM Hz - 50 Hz is the normal rate in RC cars, higher rates
+# may damage analog servos.
+#
+set PWM_RATE 50
+
+#
+# This is the gimbal pass mixer.
+#
+set MIXER_AUX pass
+set PWM_AUX_OUT 1234