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Showing content from https://docs.unity3d.com/Packages/com.unity.ugui@1.0/api/UnityEngine.UI.Navigation.html below:

[Serializable]
public struct Navigation : IEquatable<Navigation>

Return a Navigation with sensible default values.

public static Navigation defaultNavigation { get; }

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // Required when Using UI elements.

public class ExampleClass : MonoBehaviour
{
    public Button button;

    void Start()
    {
        //Set the navigation to the default value. ("Automatic" is the default value).
        button.navigation = Navigation.defaultNavigation;
    }
}

Navigation mode.

public Navigation.Mode mode { get; set; }

Specify a Selectable UI GameObject to highlight when the down arrow key is pressed.

public Selectable selectOnDown { get; set; }

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class HighlightOnKey : MonoBehaviour
{
    public Button btnSave;
    public Button btnLoad;

    public void Start()
    {
        // get the Navigation data
        Navigation navigation = btnLoad.navigation;

        // switch mode to Explicit to allow for custom assigned behavior
        navigation.mode = Navigation.Mode.Explicit;

        // highlight the Save button if the down arrow key is pressed
        navigation.selectOnDown = btnSave;

        // reassign the struct data to the button
        btnLoad.navigation = navigation;
    }
}

Specify a Selectable UI GameObject to highlight when the left arrow key is pressed.

public Selectable selectOnLeft { get; set; }

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class HighlightOnKey : MonoBehaviour
{
    public Button btnSave;
    public Button btnLoad;

    public void Start()
    {
        // get the Navigation data
        Navigation navigation = btnLoad.navigation;

        // switch mode to Explicit to allow for custom assigned behavior
        navigation.mode = Navigation.Mode.Explicit;

        // highlight the Save button if the left arrow key is pressed
        navigation.selectOnLeft = btnSave;

        // reassign the struct data to the button
        btnLoad.navigation = navigation;
    }
}

Specify a Selectable UI GameObject to highlight when the right arrow key is pressed.

public Selectable selectOnRight { get; set; }

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class HighlightOnKey : MonoBehaviour
{
    public Button btnSave;
    public Button btnLoad;

    public void Start()
    {
        // get the Navigation data
        Navigation navigation = btnLoad.navigation;

        // switch mode to Explicit to allow for custom assigned behavior
        navigation.mode = Navigation.Mode.Explicit;

        // highlight the Save button if the right arrow key is pressed
        navigation.selectOnRight = btnSave;

        // reassign the struct data to the button
        btnLoad.navigation = navigation;
    }
}

Specify a Selectable UI GameObject to highlight when the Up arrow key is pressed.

public Selectable selectOnUp { get; set; }

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class HighlightOnKey : MonoBehaviour
{
    public Button btnSave;
    public Button btnLoad;

    public void Start()
    {
        // get the Navigation data
        Navigation navigation = btnLoad.navigation;

        // switch mode to Explicit to allow for custom assigned behavior
        navigation.mode = Navigation.Mode.Explicit;

        // highlight the Save button if the up arrow key is pressed
        navigation.selectOnUp = btnSave;

        // reassign the struct data to the button
        btnLoad.navigation = navigation;
    }
}

Enables navigation to wrap around from last to first or first to last element. Will find the furthest element from the current element in the opposite direction of movement.

public bool wrapAround { get; set; }

Note: If you have a grid of elements and you are on the last element in a row it will not wrap over to the next row it will pick the furthest element in the opposite direction.

public bool Equals(Navigation other)

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