Davidson & Associates, Inc. was perhaps most well-known for their Math and Reading Blaster computer games. However, in 1998, a subsidiary of Davidson called Learningways, Inc. created a series of computer games called Learning Voyage. Davidson owned the trademark, copyright, and publishing rights, but credit has also been given to Learningways. It's possible (though unconfirmed) that these games were released to schools only.
There were two games in the series: Learning Voyage: Sand Trapped! (Grade 3) and Learning Voyage: Swamped! (Grade 4). Some have also just called them Learning Voyage (Grade 3) and Learning Voyage (Grade 4).
There used to be a video on YouTube of the intro cutscene, but this is now long gone. However, all is not lost. Designers Laura Juitt and Julian D Landa have posted screenshots from the games to their portfolios. (Note that one of the screenshots on Landa's portfolio is incorrectly labeled as being from Learning Voyage, when it is actually from Geometry Blaster, a different Davidson computer game.)
Information on the minigames found within the games can be found on the website for Classwell, one of the publishers of educational software suite Classworks Gold, which included the Learning Voyage games (the file names begin with "lv" and "lvr"). The PDFs also include monochrome screenshots.
No copies have shown up on Amazon or eBay.