NEMO° | Online Maritime Courses


This 100% online Radar Observer (Unlimited) course provides an in-depth study of the application of Radio Detection and Ranging (RADAR) equipment in regards to collision-avoidance and navigation at sea using vector solutions of vessel motion. There is also a special emphasis on RADAR and Automatic RADAR Plotting Aid (ARPA) performance limitations and adverse environmental effects on the system.

Realistic and detailed RADAR and ARPA simulation is used in this course to apply theory principles to practical exercises. The students develop both the mental and manual skills needed to safely use an ARPA equipped RADAR in a real time marine environment. Students will then have to complete practical examinations via HALO° examination systems. Radar-Observer certificates are issued to students upon successful completion of this course.
Integrated with both the HALO° Radar Training Simulator and HALO° Exam Monitoring System, students can easily complete their practical assessments and take their exams online, eliminating the need to travel to an in-person center.
Please note that the HALO° Radar Training Simulator is only compatible with a Windows computer/laptop.

The course satisfies the requirements of: the radar observer standards of competence required by STCW Code Section A-II/1 and A-II/3 and Tables A-II/1 and A-II/3, as amended 2010.

Upon completion of the online study materials, students will be able to complete their written exams online using our HALO° exam monitoring application and will complete their Radar Plotting Exam online by scheduling with one of our instructors remotely. Please contact the Registration Office at 508-992-4025 or at for remote assessment scheduling information.

Optional Navigation Tools:
*These tools are listed for anyone who would like to plot on paper by hand for additional practice along with the online tools.

  • Leaded Compass 6″ or 8″
  • Dividers 6 or 8″
  • 2 Triangles
  • One of the following:
    • Parallel Rules OR
    • Weems Roller Plotter
  • Blank Radar Transfer Plotting Sheets
*This course expects a student to spend 36-40 hours of reading material, problem solving and quizzes to be well prepared for the exam.
Price: $825.00 USD (eff. 10/01/2021)

Watch the video below to learn about the key features and capabilities of one of the simulators used in this course – the HALO° Transfer Plotter!