Agree completely with roundwego. You can't look at one page of that particular route guide in isolation from the rest of the information on the second page. Furthermore the crew would have been very familiar with the use of company route guides and would (should) have known of the necessity to read the complete document, the significance of spot heights, and the strengths and limitations of the guide. Without knowing the company SOP with regard to route guides it is premature to apportion "blame" to the route designer or management. For all we know that route may have been restricted to particular weather minima, minimum altitudes, speeds, etc. It certainly doesn't look like it's meant to be used as an instrument approach plate.