This is a fundamental point in understanding how the calculations made by the program relate to how you would actually sail a course. If you enter a route into the program manually, you are telling the program the exact route
Version 2.10
Major rewrite of Polar Manager, move to Bluewater-specific .plr file format. Expedition/Deckman still supported. Sailonline polar files are now supported. Substantially more editing functions added to Polar Manager. Route manager modified to combine routes and marks into one display tree.
Version 1.80
NMEA input revised to be more robust.
It looks like the optimizer has created routes over land.
Normally, if you attempt to optimize a route between two points on water (whether ocean, lake, or pond), Bluewater Racing will limit the route to that body of water. It will not route your vessel across land. Sometimes, however, the
Version 1.70
Optimization is now substantially faster. Added options to control date format and ETE format in route manager and route details windows.
Peregrine Wins Transpac 2011 Division VI Using Bluewater Racing

The Hobie 33, skippered by Simon Garland with navigator Jeff Westbrook, corrected out six hours ahead of its nearest competitor to take the Division VI trophy.
Version 1.60
Enhanced support for NMEA instruments. Updater is now silent during updates. Bug fixes: When sorting route manager entries by column, colors of routes were lost. Repaired bug in gribDescription.tcl popup for cloud cover. Performance functions will no longer erroneously use
“Endpoint is unreachable” error
This error can occur for several reasons. You have specified one or more route points that are actually on land. The router will not route over land. To see exactly where your route points are located, from the program’s point
Is There a UNIX/MAC OS version?
A port to Mac OSX has been in the works for a while but there are still little sticky issues. A beta version with not all functionality perfect may be available upon request. Please send a request through the Contacts
Version 1.50
Automatic update checking now included. Printing of route details.