<< 1 >>
Rating: 
Summary: Proven Cruising Routes: Percise Courses to Steer: Seattle to
Review: The words "Proven" and "Precise" made me assume that the data would have a high degree of accuracy. When the 5th waypoint I entered showed up 30 miles East of Bellingham instead of the Gulf Islands I suspected a problem. I thought I had found a typographic error that must have been part of the publishing process. I discovered from the publisher's web site that there is a long list of other errors that you want to be aware of and it didn't include the one I found. I emailed the author, Kevin Monahan, and was told "The error was one degree which is 60 miles, it comes from misreading the edge of the charts as you move along the latitude line near a full degree mark." In the errata sheet there were many others with the one degree error. If Kevin is right about the source, then these waypoints were never actually used, nor were then even entered into a charting package, or a plotting GPS. Both units would clearly have shown up errors this large. Needless to say I am going to be very careful how I use the data. Fortunately I do have a charting GPS, which is how the first error showed up.
<< 1 >>
| 
