Radar Simulator

Learn marine radar the way it should be learned: by using it.

Marine radar is one of the most important tools on the bridge — but it is also one of the hardest to truly understand from a textbook alone.

The NavSim Academy Marine Radar Simulator gives students a realistic, hands-on way to practice radar interpretation, target tracking, collision avoidance, clutter tuning, ARPA/AIS decision-making, and navigation awareness in a safe training environment.

Instead of simply reading about radar concepts, students work through guided scenarios, adjust real radar-style controls, track vessels, interpret echoes, and learn how radar behaves in clear weather, rain, clutter, close quarters, and multi-target situations.

This is a radar-training simulator, not a certified navigation device, and is designed specifically for education and practice.

Built for students who want real understanding

Radar can feel confusing at first: land echoes, target trails, AIS labels, radar-only contacts, CPA, TCPA, ARPA acquisition, rain clutter, sea clutter, range rings, EBL, VRM, guard zones, and motion modes all compete for attention.

This simulator breaks those ideas into manageable lessons. Students begin with the basics — recognizing land on the radar screen — and gradually build toward advanced watchkeeping decisions in traffic and poor visibility.

By the end of the course, students are not just pushing buttons. They are learning to think like a radar operator.

What you will learn

Recognize land, targets, and clutter

Start with a clean radar display and learn how coastlines, islands, empty water, target echoes, and clutter appear on the scope. The first lesson is built around land recognition, helping students understand that radar is not a map — it is an echo picture.

Measure range and bearing

Use the VRM, or Variable Range Marker, and EBL, or Electronic Bearing Line, to measure target distance and bearing. Students learn how to turn the radar picture into useful navigation information.

Understand relative motion and true motion

Watch how a stationary object can appear to move when your own vessel is underway. The simulator helps students build a practical mental model of what the radar display is really showing.

Track targets manually

Use trails and vectors to understand where targets have been, where they are going, and whether they are opening, crossing, or closing. This builds the visual judgment needed before relying on automated numbers.

Identify collision risk

Practice the classic constant-bearing, decreasing-range situation and learn how to confirm collision risk using CPA and TCPA. The simulator teaches students to combine visual radar interpretation with numerical decision support.

Use AIS and ARPA together

AIS-equipped vessels provide identity, course, speed, and other information. Radar-only targets do not. Students learn how to acquire radar-only targets manually with ARPA and wait for a stable solution before trusting course, speed, CPA, and TCPA.

Tune radar in bad weather

Gain, sea clutter, rain clutter, and pulse length all affect what appears on the radar. In rough weather and heavy rain, students must adjust the controls carefully enough to reveal a small target hidden in the clutter.

Understand radar limitations

Radar cannot see through solid land. Students learn about radar shadows, hidden targets, intermittent echoes, and why radar must be cross-checked with charts, AIS, and lookout.

Make decisions in traffic

Advanced scenarios place multiple targets on the screen at once. Some are safe, some are distracting, and one may be dangerous. Students must decide where to focus their attention and why.

A complete guided training course

The simulator includes built-in lessons that progress from beginner to advanced:

1. Basic Land Recognition — understand what land looks like on radar.
2. Range and Bearing — use EBL and VRM to measure targets.
3. Relative vs. True Motion — understand apparent motion on the radar scope.
4. Manual Tracking — use trails to judge target movement.
5. Collision Course Detection — recognize constant bearing and decreasing range.
6. ARPA Acquisition — manually acquire radar-only targets.
7. Radar Tuning — adjust gain, sea clutter, and rain clutter.
8. Radar Limitations — learn about shadows, occlusion, and hidden targets.
9. Multi-Target Decision Making — prioritize threats in a busy picture.
10. Final Evaluation — combine everything in a challenging scenario.

Each lesson includes a scenario briefing, objectives, and simulator settings such as own-ship speed, heading, weather, traffic, and radar range.

Real radar concepts, safe practice environment

The simulator includes many of the features students need to understand on real radar displays:

• Radar scope with range rings, bearing marks, heading line, trails, vectors, AIS symbols, ARPA symbols, guard zones, and coastline echoes.
• North Up, Head Up, and Course Up orientation modes.
• Relative Motion and True Motion display modes.
• Adjustable range, pulse length, gain, sea clutter, and rain clutter.
• EBL and VRM measurement tools.
• AIS targets and radar-only contacts.
• Manual ARPA acquisition.
• CPA/TCPA alarms.
• Guard zones for vessel and land intrusion.
• Live chart plotter view.
• Built-in lesson selector, scenario briefings, and lesson videos.
• Custom scenario editor for creating new training exercises.

These are all described as part of the simulator’s operating guide and screen layout.

Practice the moments that matter

The most important radar decisions often happen when conditions are not ideal.

A target appears in rain clutter.
A vessel has no AIS.
A shoreline creates a radar shadow.
A contact stays on a constant bearing.
A new threat appears late.
The screen is busy, and not every target deserves equal attention.

The NavSim Academy Marine Radar Simulator lets students practice these situations repeatedly, without risk, until the patterns become familiar.

Why this matters

Radar mastery is not about memorizing button names.

It is about building judgment.

A skilled radar operator knows when a target is dangerous, when an alarm matters, when clutter is hiding something, when AIS is incomplete, and when the absence of an echo does not mean the absence of danger.

This simulator was built to help students develop that judgment before they need it on the water.