🔍 Key Concepts
• Chart scale categories used by NOAA/USCG (Harbor, Coastal, General, Sailing)
• Difference between large-scale vs. small-scale charts (which shows more detail?)
• Typical scale ranges associated with harbor, coastal, general, and sailing charts
💭 Think About
• Think about whether 1:80,000 shows a small area with a lot of detail, or a large area with less detail.
• Compare 1:80,000 to a very detailed harbor chart like 1:10,000 and to a broad ocean passage chart like 1:1,000,000. Where does 1:80,000 fit?
• Ask yourself: which chart type would be used for near‑shore navigation along a stretch of coastline rather than close‑quarters pilotage or open-ocean planning?
✅ Before You Answer
• Confirm which chart type is considered largest scale and most detailed (used right in the harbor).
• Confirm which chart type is smallest scale and least detailed, used for long ocean passages.
• Match the scale 1:80,000 to the typical scale ranges of harbor, coastal, general, and sailing charts before choosing.