Despite what 'capta" says, learning the stars, the theory, the plotting and the taking of sites, (noon, three body, North Star and others) that enable you to plot your position is an excellent discipline and a good learning experience. To me, it does not matter if you take the course on "some beach in Canada" or on capta's boat "somewhere in the Windward or Leeward Islands". Don't discount the task, the skills involved, nor the experience.
The OP never said he wanted to use it to sail across the ocean. If all you are looking at is being "adequately equipped to navigate across an ocean for about $100", IMHO, a much better Return on Investment is a Cheap Ticket for $199.00 from New York to London and you can be there in 6 hours and 55 minutes.
Rik