The use of these spreadsheets is self-explanatory, and there are remarks below the main display.
However, find here a few further explanations.

- The spreadsheet is protected, so that only the input cells can be reached.  If your Excel is set to move to the right after pressing Enter, every time you fill a cell, you just press Enter and Excel automatically brings you to the next data cell.  If you wish to tamper with your copy of the spreadsheet, you may do so by removing the protection: there is no password.  Note however that you cannot upload to the web changes to my spreadsheet.

- The Longitude above "Magn.Map" is an East Longitude from 0 to 359.  It is useful if you get your Magnetic Variation/Declination from maps such as http://www.ngdc.noaa.gov/seg/data/mag_maps/pdf/D_map_mf_2005.pdf

- When you enter the Start Location's Magnetic Variation, integer Degrees are precise enough for most purposes.

- If you only need a Heading and are not interested in TAS, Wind Drift or Ground Speed, you may leave blank or zero the 4 fields with yellow background: Pressure Altitude, KIAS and Wind paramenters.

- The spreadsheet calculates the final results in this order: Distance, True Course(geographic), Magnetic Course (True Course corrected for Magnetic Variation), Magnetic Heading (Magnetic Course corrected for wind drift), True Heading (True Course corrected for wind drift but NOT for Magnetic Variation, which is needed for the Ground Speed calculation) and Ground Speed.
The main results you use most of the time are of course Distance, Magn. Heading and Ground Speed.
	- Distance: you use this to compute the Fuel needed from Start to End
	- Magn. Heading: this is the compass heading you have to follow: you may set it into the Autopilot
	- Ground Speed: you use this to compute the time needed to fly from Start to End.

- Typically every half-your of flying, say, you use your sextant (or the red line you get in FS2004 by Shift+Z) to compute your present geographical co-ordinates, enter them in the spreadsheet, also get from the Magn.Decl.Map the Magn. Variation and enter it followed by your Airspeed and Wind data.  The spreadsheet will then give you an updated Magn. Heading.
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