The simulator is best experienced on a desktop browser for full functionality.
Radar Skills
for Every Mariner
A high-fidelity, physics-based radar simulator. Practice relative motion plotting, CPA/TCPA calculation, and COLREGS Rule 19 decisions — right in your browser.
Not ready to subscribe?
Realistic Radar Scope
Canvas-rendered PPI with gain, sea/rain clutter, EBL/VRM, trails, RACON, and blind sectors — tuned like a real marine radar.
Navigation Training
Range-and-bearing fixes, position determination, and GPS/heading-sensor discrepancy diagnosis across 8 structured modules.
Collision Avoidance
CPA/TCPA calculation, relative motion analysis, ARPA/MARPA tracking, and COLREGS Rule 19 decision-making practice.
Built for every mariner
Whether you're pursuing a certification or just want to be safer on the water, the simulator adapts to your goals.
Pursuing your ASA 120?
The full 8-module curriculum is aligned with ASA 120 Radar Endorsement requirements, with graded quizzes and progress tracking.
- 8 structured modules — fundamentals to Rule 19
- Graded sim quizzes with instructor answer keys
- Personal gradebook tracking your scores
- Google Classroom integration for course assignments
Just want to be a safer navigator?
Skip the curriculum and jump straight into the simulator. Practice the radar skills every mariner needs — no certification required.
- Realistic radar scope with full tuning controls
- Relative motion plotting and collision avoidance
- CPA/TCPA calculation and COLREGS Rule 19
- Build-your-own scenarios for custom practice
What Students Say
Real feedback from mariners who trained with the simulator.
"This simulator transformed my understanding of relative motion!"
Meet Your Instructor
Captain Andy Deen · USCG Master 100-Ton
Two-time Instructor of the Year Captain Andy Deen built this simulator to bring his on-the-water curriculum online — so you can practice radar navigation and collision avoidance at your own pace, in any browser.
Ready to start training?
Subscribe today and get full access to the simulator, training modules, and scenario library.