Rover: use floats for get/set output scaled

Rover/defines.h

@@ -11,7 +11,7 @@
 #define ENABLE ENABLED
 #define DISABLE DISABLED
 
-#define SERVO_MAX 4500  // This value represents 45 degrees and is just an arbitrary representation of servo max travel.
+#define SERVO_MAX 4500.0  // This value represents 45 degrees and is just an arbitrary representation of servo max travel.
 
 // types of failsafe events
 #define FAILSAFE_EVENT_THROTTLE (1<<0)

Rover/sailboat.cpp

@@ -293,7 +293,7 @@ void Sailboat::get_throttle_and_mainsail_out(float desired_speed, float &throttl
                 mast_rotation_angle = 90.0f;
                 if (wind_dir_apparent_abs > 135.0f) {
                     // wind is almost directly behind, keep wing on current tack
-                    if (SRV_Channels::get_output_scaled(SRV_Channel::k_mast_rotation) < 0) {
+                    if (is_negative(SRV_Channels::get_output_scaled(SRV_Channel::k_mast_rotation))) {
                         mast_rotation_angle *= -1.0f;
                     }
                 } else {