Due to the Covid-19 virus Captains is temporarily suspending orders



The Compute-A-Course is a compact, multi-purpose plotting tool ideal for adding to your general boating or commercial navigational tools. The Compute-A-Course navigational tools can be used for position fixing, course plotting, and distance measurements with the included scales. 


Used for course plotting, distance measuring and position fixing. Instructions for use located on back of vinyl storage sleeve. Logarithmic speed scale for solving time/speed/distance located on back of sleeve. Lifetime warranty.


  • Compact
  • Multi-purpose tool
  • Quick time/distance calculations using log scale