Forwarding Direction | Condition |

East | δx > 0, δy = 0 |

West | δx < 0, δy = 0 |

North | δx = 0, δy > 0 |

South | δx = 0, δy < 0 |

North-East | δx > 0, δy > 0 |

South-East | δx > 0, δy < 0 |

North-West | δx < 0, δy > 0 |

South-West | δx < 0, δy < 0 |