🔍 Key Concepts

• 33 CFR 164.37 – Equipment: Marine radar (U.S. radar carriage requirements) • Meaning of gross tonnage (GT) and how thresholds are often set in regulations • Differences between 1,400, 1,500, 1,600, 1,700 GT as typical regulatory cut‑off points

💭 Think About

• Which of these tonnage values is commonly used in U.S. regulations as a key threshold for additional navigation equipment like radar? • Look up the specific wording in 33 CFR Part 164: What minimum gross tonnage does it specify for mandatory marine radar for surface navigation? • Are any of these tonnage values familiar from other equipment requirements (e.g., gyrocompass, radar plotting) that might help you remember the pattern?

✅ Before You Answer

• Verify in 33 CFR 164.37 the exact phrase: "Each vessel of ____ gross tons or over must have a marine radar system for surface navigation" • Confirm that the tonnage in the regulation is expressed in gross tons (GT) and not another measurement like NT or ITC GT • Double‑check that you are looking at the current version of 33 CFR (not an outdated edition) before deciding.