I have consistently noticed that my Hunter 34 on a starboard tack my speedo reads nearly 1-knot less that on a port tack. My gut is that the reading is accurrate that I am not getting the boat speed on my starboard tack that I am getting on a port tack. I have tried to make adjustments with nothing making a significant change. My wind direction indicator I also believe is giving me an inaccurrate reading as I can point higher on a port tack than a starboard by about 10-15 degrees. Any suggestions?