FlyBy E6B is an essential application for all pilots. Designed by a professional airline pilot it includes many features not found in the "other" E6B programs.
If you are considering a career in aviation FlyBy E6B has functions that you can use in every aircraft you will fly.

FlyBy E6B was one of the very first applications of its kind published for the Palm Pilot. Used by thousands of pilots the world over, it has evolved from the suggestions and feedback we have received.
Please select the "Show All Versions" item on this page to see all the features we have added from suggestions we have received.

Please visit our web site for more detail and screen shots.

FlyBy E6B Features (60+):

Airspeed Calculations:
- True Airspeed using Calibrated Airspeed
- True Airspeed using Mach#
- Calibrated Airspeed using TAS
- IAS Using MACH#
- Equivalent Airspeed using CAS
- Mach# Using TAS
- Mach Crossover Altitude
- Planned MACH#
- Planned TAS
- Vref CAS

Wind Calculation:
- Find Wind Direction and Speed
- Find Wind Component (headwind and crosswind)

Heading and Ground Speed:
- Find Heading, Ground Speed, ETE and Fuel Burned

- Find Estimated Time Enroute
- Find Ground Speed
- Find Distance
- Find Fuel Time
- Find Fuel Flow
- Find Fuel Burned
- Find Estimated Time of Arrival
- Journey Log Time
- Time Adder
- Fixed GroundSpeed (Find a True Airspeed given a track, wind and required groundspeed)

Altitude Calculations:
- Density Altitude
- Pressure Altitude
- True Altitude
- Cold Temperature Altitude Correction
- China RVSM Airspace

Vertical Navigation Calculations:
- Distance and Time using Altitude Change, Ground Speed, Vertical Speed
- Rate of Descent using Altitude Change, Ground Speed, Distance
- Rate of Descent using Altitude Change, Ground Speed, Descent Angle
- Feet/Nm using Vertical Speed, Ground Speed
- Feet/Nm (%) using Gradient %, Ground Speed
- Rate of Climb using Required Climb Gradient and Ground Speed
- SCDA (Constant Descent Angle)
- VDP (Visual Descent Point)
- VPA Deviation (Vertical Path Angle Deviation)

Navigation Calculations:
- Critical Point
- Equal Time Point
- Point of No Return
- Time to Minimum Descent Altitude
- Track and Distance between two points with map plotting of the great circle track. Map plotting includes movable pin locations with instant trip information: Distance, Track and time enroute.
- Map GPS mode. Displays device Speed, True Course, Altitude, Distance Remaining, Track to Destination, cross track error, estimated time remaining and estimated time of arrival.
- Map closest airport feature will display airports close to your current GPS location or a dropped pin location.
- Fix. Calculate a map point based on a Fix, Radial and Distance.
- Rate One Turn
- Radius of Turn
- Turning Stall Speed
- DME Arc distance and time.

- Distance:
Nautical Miles/ Knots
Statute Miles/ Mph
Kilometers/ Kph

- Volume:
US Gallons
Imperial Gallons

- Temperature:

- Weight:

- Altimeter:
Inches Hg

- Fuel, Temperature Corrected, JetA, JetB, AvGas:
US Gallons
Imperial Gallons

- QFE/QNH airfield altitude conversion

- DMS/DM.m/DM.m and D.d coordinate conversion

Feet per NM

- Relative Humidity, Heat Index, Cumulus cloud base, Wind Chill
- NOAA METAR and TAF access
- ISA Temperature Deviation

Other Functions:
- Linear Interpolation
- Minimum Floor Load Limit (Cargo)
- Maximum Cargo Weight
- Runway Slope
- PAX Weight
- C.G. Change
- Weight to Shift
- Distance to Shift
- Sunrise/Sunset: Civil Day/Night, Azimuth, Apex, Elevation, for any location and time/date. Includes a unique sunset ETA function that calculates your current flights sunset time.

What’s New

Version 2.90

Lots of changes for iOS 13.
- Added new function: Equal Time Point
- Adjusted all iPad screens for new iPad OS.
- Reduced screen colors and improved ""Night Mode"" compatibility.
- Changed heading mode in map view. It now refreshes displayed track label to true or magnetic
- Metar page now automatically loads latest metar.

Ratings and Reviews

4.4 out of 5
8 Ratings

8 Ratings

Guscfi ,

Nice app

Very nice and comprehensive, the ease of use is very nice and intuitive. Wish I would have had something like this when I was a student. As an airline Captain, there are many useful items that are now indispensable, specially the conversions from metric to standard systems. I'm sure the are items that can be improved but as it stands, it's a very nice app for the money.

Desmond Brophy ,

Exceptional App

I am an experimental test pilot with Bombardier Learjet. I use Lonnie’s app frequently for test mission planning and execution. It is reliable and thorough. Highly recommended.

Volare1 ,

Fantastic Application

I got my general pilots license in the 90s thanks to FlyBy E6B... as a student, what a nightmare it was to do calculations with the old aluminum E6B computer; capable but primitive. I used to think, "Nasa put men on the moon using slide rules, so I can solve these problems " Then as a miracle I discovered FLyBy's E6B for my palm pilot and how easy and fun it was to do calculations and -as a multinational guy that I am- for everyday use converting temperature and distances. I liked it so much that I got the desktop version and used it all the time. As technology progresses, I was very happy to find that FlyBy E6B was available as an App for the iphone. Their customer service is fantastic, Lonnie always responds emails promptly trough out the years. (Unlike Jeppesen, where I bought two aviation calculators, and both after the battery died couldn't be brought up to life again with a fresh battery, and Jeppesen didnt stand behind their product saying that there was a problem with the calculators and they didnt support them any longer.)

I recommend highly FlyBy E6B and it will always have good memories and a soft spot in my heart...


Lonnie Ganz
23.2 MB

Requires iOS 13.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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