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Knowledge Base /FAQ's  
   
Known Issues:  
 
Date Description Status
1-04-05 Received a report of a "Cosmetic" installation error when installing onto a clean Win2000 SP 4. Cosmetic meaning the GPS2CAD still ran fine. Perhaps an installation issue with Win 2000 Will be watching for additional reports.
1-03-2005 There is an intermittent problem uploading Magellan Routes. Sometimes a route fails to upload. Resolved 1-04-05
     
     
     
 
   
   
   
FAQ's  
  When I download points from a Magellan, they’re not in the proper order  
  what about plotting in 3d?  
  sometimes I have trouble connecting to my Magellan. It fails the first time, and succeeds after that. Why?  
  How does the program convert bearings and distances?  
     
     
     
     
     
     
     
     
     
     
     

 

 

  How does the program convert bearings and distances? There are two methods used for calculating bearing and distance. When using a grid projection, it uses plane trig. Plane doesn’t mean ordinary, but a flat surface – it doesn’t account for the curvature of the earth. If you have converted coordinates to a datum (i.e. lat/long format) it uses a method called the Haversine formula. There are two commonly used methods to find bearing and distance between two points on earth. The older and more traditional method is called the Great Circle method. However because of the math involved, it doesn’t work well on short distances, the type you work with on a hand held gps unit. The Haversine method of calculations is also widely known and used, but somewhat newer. It is designed to provide better results on short distances.  
 

When I download points from a Magellan, they’re not in the proper order
That’s how Magellan units export their points. To resolve this you can click on the grid columns to sort the points.

  
 

Q what about plotting in 3d?

A – GPS2CAD plots points and blocks in 3d, based on your selection in ACAD preferences. It does not plot lines in 3d. The reason for this is that it plots “light weight polylines” which is the default for ACAD. These lines do not have a separate elevation(z axis) for each vertex – that’s why they’re “light weight”. This concept also applies to the dxf export utility – points and blocks are exported in 3d, lines are not.

  
 

Q – sometimes I have trouble connecting to my Magellan. It fails the first time, and succeeds after that. Why?

A – Magellans are a bit slow to connect. It takes them a moment to begin sending their NMEA data to an outside device. Make sure you have started your Magellan, are past the license screens, and all the way into a map or menu item, and have given the device a second or two to “get going”.

  
     

 

 

 

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