🔍 Key Concepts

• Radar range scales and range rings on marine radar displays • How many range rings (dots or intervals) are typically used to divide the selected range scale • Basic division: total range ÷ number of intervals

💭 Think About

• Think about how many equally spaced dots or range rings usually appear on a radar screen for a given maximum range. Is it divided into 5 parts, 8 parts, 10 parts, etc.? • If the maximum range is 5 miles, what distance would each interval represent if there were, for example, 8 intervals? What if there were 10 intervals? • Compare your calculated interval distance with the multiple‑choice answers and see which value is closest to what you’d expect for a standard marine radar scale.

✅ Before You Answer

• Be clear whether the question is talking about distance between adjacent dots (intervals), not the total radius. • Double‑check your division of 5 miles by the assumed number of dots/intervals to avoid simple math errors. • Confirm that your chosen option matches a reasonable, evenly divisible fraction of 5 nm based on a typical number of range intervals.