A class to convert between bearings and compass directions. License: MIT

Compass.cs

public static class Compass
{
  public enum CompassDirection { N, NbE, NNE, NEbN, NE, NEbE, ENE, EbN, E, EbS, ESE, SEbE, SE, SEbS, SSE, SbE, S, SbW, SSW, SWbS, SW, SWbW, WSW, WbS, W, WbN, WNW, NWbW, NW, NWbN, NNW, NbW }
  public enum CompassPoints { Four = 4, Eight = 8, Sixteen = 16, ThirtyTwo = 32 }

  public static Dictionary<CompassDirection, string> CompassDirections
  {
    get
    {
      return new Dictionary<CompassDirection, string>()
      {
        { CompassDirection.N, "North" },
        { CompassDirection.NbE, "North by east" },
        { CompassDirection.NNE, "North-northeast" },
        { CompassDirection.NEbN, "Northeast by north" },
        { CompassDirection.NE, "Northeast" },
        { CompassDirection.NEbE, "Northeast by east" },
        { CompassDirection.ENE, "East-northeast" },
        { CompassDirection.EbN, "East by north" },
        { CompassDirection.E, "East" },
        { CompassDirection.EbS, "East by south" },
        { CompassDirection.ESE, "East-southeast" },
        { CompassDirection.SEbE, "Southeast by east" },
        { CompassDirection.SE, "Southeast" },
        { CompassDirection.SEbS, "Southeast by south" },
        { CompassDirection.SSE, "South-southeast" },
        { CompassDirection.SbE, "South by east" },
        { CompassDirection.S, "South" },
        { CompassDirection.SbW, "South by west" },
        { CompassDirection.SSW, "South-southwest" },
        { CompassDirection.SWbS, "Southwest by south" },
        { CompassDirection.SW, "Southwest" },
        { CompassDirection.SWbW, "Southwest by west" },
        { CompassDirection.WSW, "West-southwest" },
        { CompassDirection.WbS, "West by south" },
        { CompassDirection.W, "West" },
        { CompassDirection.WbN, "West by north" },
        { CompassDirection.WNW, "West-northwest" },
        { CompassDirection.NWbW, "Northwest by west" },
        { CompassDirection.NW, "Northwest" },
        { CompassDirection.NWbN, "Northwest by north" },
        { CompassDirection.NNW, "North-northwest" },
        { CompassDirection.NbW, "North by west" }
      };
    }
  }

  public static CompassDirection BearingToCompassDirection(Bearing bearing, CompassPoints points = CompassPoints.Eight)
  {
    int counter = 0;
    decimal interval = 360 / (decimal)points;
    for (decimal d = interval / 2; d <= 360 + (interval / 2); d += interval)
    {
      if (bearing.Value <= d)
      {
        while (counter > 31) { counter -= 32; }
        return (CompassDirection)counter;
      }
      counter += 32 / (int)points;
    }
    throw new Exception(string.Format("An unknown exception occurred in BearingToCompassDirection; bearing={0}, points={1}.", bearing.Value, points));
  }

  public static Bearing CompassDirectionToBearing(CompassDirection compassDirection)
  {
    return new Bearing() { Value = 11.25m * (int)compassDirection };
  }

  public struct Bearing
  {
    private decimal _value;
    public decimal Value
    {
      get { return _value; }
      set
      {
        while (value < 0) { value += 360; }
        while (value > 360) { value -= 360; }
        _value = value;
      }
    }

    public string ToThreeFigureBearing()
    {
      return ((int)Value).ToString("D3");
    }
  }
}