🔍 Key Concepts

• Local mean time vs Greenwich Mean Time (GMT/UTC) on a navigational chart or problem • How letter prefixes (like L, G, Z, etc.) are used in front of a four‑digit time to show the kind of time being given • Difference between time, latitude, and longitude notations in navigation

💭 Think About

• Ask yourself: when we write 1210 as four digits in navigation, what units is that usually in (degrees/minutes or hours/minutes)? • Think about what the letter just before the four‑digit number usually represents in time notation on charts and publications. • Consider whether latitude or longitude would normally be written with a leading letter and only four digits, or if they usually show degrees AND minutes symbols (° and ').

✅ Before You Answer

• Confirm how zone time and GMT/UTC are normally written in nautical publications (look for a letter and four digits). • Check how latitude and longitude are normally formatted: do they usually include N/S or E/W and degree (°) and minute (') symbols? • Verify what the letter L commonly stands for when placed directly before a four‑digit time group in navigation problems.