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Difficulty: HardMain Idea and Primary Purpose

Passage: While nineteenth-century cartographic historians largely characterized the emergence of the Mercator projection in 1569 as an immediate paradigm shift that rendered late-medieval portolan charts obsolete, recent archival analyses suggest a far more nuanced transition in maritime navigation. Early modern mariners did not abruptly abandon portolan charts—which relied on rhumb lines and visual landmarks—in favor of conformal cylindrical projections. Instead, practical navigators across Mediterranean and Atlantic routes maintained a dual cartographic tradition for nearly a century. Portolan charts remained uniquely suited for coastal cabotage and short-distance dead reckoning due to their empirical accuracy regarding coastline contours and harbor locations. Conversely, Mercator’s projection, despite its revolutionary ability to represent lines of constant bearing (loxodromes) as straight lines, gained traction primarily among transoceanic navigators and theoretical hydrographers who possessed the mathematical training required to adjust for latitude distortion at high elevations. Consequently, the adoption of Mercator's framework was not a sudden eclipse of archaic methods by superior mathematics, but rather a protracted period of functional co-existence dictated by specific navigational contexts.

Based on the passage above, which of the following statements accurately characterize the primary purpose of the text?

  1. To challenge a traditional historiographical view regarding the adoption timeline and practical usage of sixteenth-century navigational projections.Answer
  2. B
    To detail the precise mathematical calculations required by hydrographers to correct latitude distortion on conformal charts.
  3. To contend that the shift between navigational cartographic tools was defined by functional co-existence based on specific operational needs.Answer
  4. D
    To argue that early modern mariners rejected Mercator's projection due to an inherent skepticism toward theoretical mathematics.
  5. E
    To criticize nineteenth-century cartographic historians for intentionally fabricating historical accounts of maritime technological progress.

Answer

The primary purpose of the passage is to challenge a traditional historiographical view regarding sixteenth-century navigational cartography and to contend that the shift between cartographic tools was characterized by functional co-existence based on specific operational needs.
The passage primarily serves to re-examine the historical transition from portolan charts to the Mercator projection. It begins by contrasting an older historiographical consensus—which claimed Mercator's projection immediately rendered portolan charts obsolete—with recent archival research showing that both cartographic methods co-existed for nearly a century due to their distinct practical applications. Therefore, the statements highlighting the challenge to traditional historiography and the emphasis on functional co-existence accurately articulate the main purpose of the text.

Step-by-Step Solution

1
Analyze the opening structure and thesis shift
Identified the contrast between the traditional nineteenth-century view (immediate displacement of portolan charts) and new archival evidence (nuanced transition).
Determining how the author frames the discussion against prior historiography establishes the primary communicative goal.
2
Evaluate the body paragraphs and supporting arguments
Noted that portolan charts and Mercator projections filled complementary roles—coastal cabotage versus transoceanic navigation—based on practical suitability and mathematical literacy.
Examining why both tools persisted helps clarify the core argument synthesized by the author.
3
Synthesize the main thesis and evaluate option claims
Selected the statements accurately describing the revision of historical consensus and the concept of functional co-existence, while eliminating options focusing on narrow details, unsupported psychological motives, or exaggerated tone.
Primary purpose choices must reflect the overarching scope and objective of the passage as a whole.

Key Concept

Main Idea and Primary Purpose in Academic Reading Comprehension
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Main Idea and Primary Purpose

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