The grammatical mistakes found in the text consist of the incorrect use of the articles "a" and "an", which means we need to correct them by changing the articles.
<h3>The use of "an" and "an"</h3>
The indefinite articles "a" and "an" are used before singular nouns. The article "a" must be used before nouns that begin with a consonant sound, whereas "an" must come before those that begin with a vowel sound.
The grammatical mistakes in the text consist of using one article when the other should be employed. Let's correct them below:
... an treasure hunt --> a treasure hunt
... an handheld GPS --> a handheld GPS
... a adventure-loving nature --> an adventure-loving nature
Learn more about indefinite articles here:
brainly.com/question/19174890
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