


			Flight Computer for Avigo
			-------------------------

			(c) Andrew Sarangan, 1999

Avigo is a PDA (Personal Digital Assistant) made by Texas Instruments. It
is priced at under $100 at most office supply stores. Check 
http://www.ti.com/avigo for details.


INSTRUCTIONS
------------
Load the Main.app file into the Avigo unit. It is 81k long. If you get a
complaint that there is not enough memory, try optimizing the memory (under
Apps->Memory).

Once loaded, an airplane icon should appear under your Applications Menu. 
Click on it to launch the program.


WHY THIS PROGRAM ?
------------------

The primary intended use of this program is for calculating the winds-aloft. 
The sequence of keys on the keyboard were laid out with that requirement in 
mind. However, it can be used in the same way as any normal E6B.


HOW IT WORKS
------------
Given the altitude, temperature, dewpoint/relative-humidity, heading, track, 
IAS and ground speed, this program will calculate the winds-aloft, as well as 
density altitude, ETE, TAS, fuel required etc.. It can also be used in the 
reverse order during pre-flight.  From the forecasted winds, you can calculate 
headings, ground speeds, ETE etc.. It can also be used in several other 
contorted fashions you could think of. This flexibility comes about because all
the parameters can be either specified or calculated, ie., you can enter a 
value for it, or ask it to be computed. 

Initially all entries are blank. This is indicated by the "?" in the input
fields. When you tap on any field, it will bring up a numeric keypad. Since
all calculations are rounded to the nearest integer, you will not find the
decimal point on this keypad (who flies that accurately anyway?). If an item 
can be computed using other parameters, an "=" will be displayed on the keypad. 
Tapping on the "=" will compute the value for that item. If the parameters 
necessary for computing that item are not available, the "=" will not be 
displayed (neat huh ?). Whether the "=" is displayed or not, you can enter
any value for the parameter on the keypad. The whole thing is laid out in a 
simple intuitive way (my opinion).

Since all numbers are rounded off to the nearest integer, if you go around 
the menu tapping on the "=", the results might change every time. This is not 
a bug. Think of it as a feature that represents the tolerances encountered 
in real life flying.

This program probably has several bugs. So don't use it for serious flight 
planning. If you find any bugs or would like to see a feature added, please 
send email to sarangan@unm.edu.

