Calculate Next point based on current point, heading, bearing, DMS and distance

bearing-distance

private double[] NextPoint(double startX, double startY, string heading, string bearing, int degree, int minute, double seconds, double distance)
{
    double DEG2RAD = 4 * Math.Atan(1) / 180;
    double azimuth = degree + (minute / 60);

    string hb = heading + bearing;

    switch (hb.ToUpper())
    {
        case "NE":
            // do nothing
            break;
        case "NW":
            azimuth = 0 - azimuth;
            break;
        case "SE":
            azimuth = 180 - azimuth;
            break;
        case "SW":
            azimuth = -180 + azimuth;
            break;
        default:
            azimuth = 0;
            break;
    }

    azimuth = azimuth * DEG2RAD;

    double endX = startX + Math.Sin(azimuth) * distance;
    double endY = startY + Math.Cos(azimuth) * distance;

    return new double[] { endX, endY };
}