In Paragraphs^x, Indefinite articles^x, Nouns^x

Congratulations on your hard work. - A. Edit. "Why is the article "the" essential here?"

Look at the sentence below please and tell me why the writer of this sentence made what looks to be a choice to modify the nouns with an indefinite article. This essay contain a beginning paragraph, a middle paragraph and an ending paragraph. Would it be wrong to modify them all with a...

It is a little difficult to correct without seeing the context of the whole paragraph. I see 2 points. 1/ Your text ..'and replaced by the new GPS based technology such as a RTK'..etc. The text contains the definite article 'the new GPS..' then it reads... 'such as a (indefinite article)...