Navigating

(Edit > Find & Replace)(GoTo Tab)
F5
(Ctrl + G)
(Edit > GoTo)
Browse Object button

The two double-headed arrow buttons on the vertical scrollbar will move you to either the previous or next page. The button in between these allows you to move through your document stopping at particular objects for example headings, tables, charts etc

Scroll Bars

If the text you want to look at is not on the current page then you can use the scrollbars to move up and down within your document.
Scroll bars located along the right and bottom edges of the editing window.
You can also quickly reposition the insertion point by clicking anywhere within your document using the left mouse button.

There is a vertical scroll bar that allows you to move through a document.
To move to a specific location, click the scroll box and drag it up or down.
As you drag the scroll box the document will scroll and a screen tip will appear indicating the page number you have scrolled to.
To move up and down by one screen click anywhere in the vertical scrollbar area (above or below the scroll box).

If you are using the standard heading styles in your document then the screen tip will also display the heading for the current page as well as the page number.

Word also provide a horizontal scroll bar that lets you move from left to right.
This is useful when the page is wider than the editing window, which is often the case when you are working with landscape pages.

If your document is just slightly wider than the window, it is possible to display all the text on the screen without scrolling by using the Wrap to Window option.
Select (Tools > Options)(View tab, "Wrap to Window").
Another option is to reduce the window percentage slightly from say 100% to 90%.

Using the (Edit > GoTo) dialog box

You can customise the way you search in your document. Above and below the two scrolling arrows on the right hand side are two double arrow buttons. These default to moving to the next and previous pages respectively although you can also manoeuvre by Heading, Graphic, Field, Table, Section, Comment or Footnote

Browse Object

This also known as the Document Browser.
It is important to navigate through your document by specific objects. Click the "Browse Object" button on the vertical scroll bar, click the button for the type of browsing you would like to do. The double arrows will change colour to indicate this. To stop browsing by an object just click "Browse Object" and select to Range/Page.
Ctrl + Page Up and Ctrl + Page Down.
To check the element the Browse Object is currently set to however the mouse over one of the double arrow buttons

GoTo Tab -
Find Tab -
Edit to Edit -
Heading to Heading -
Graphic to Graphic -
Table to Table -
Field to Field -
Endnote to Endnote -
Footnote to Footnote -
Comment to Comment -
Section to Section -
Page to Page -

Important

(End) moves to the end of the current line.
(Home) - moves to the start of the current line