Fuel density calculations now allow finer-grained fuel temperature changes (now by 0.1-degree increments if desired)

True Airspeed, Pressure Altitude, and Outside/Static Air Temperature values now sync across tabs. Saves having to re-enter the same values on each tab separately. Temperatures are now adjustable in 0.1-degree increments. Time (in time-speed-distance calculations) is now adjustable in 1-second increments. This allows calculations with greater accuracy. Devices with an altimeter now display altitude by default. Makes this feature easier to discover. Fix: iOS now prompts for user permission to read Altimeter data when access is attempted. An onboarding tutorial explains how to input data, and other essential features. Minor appearance tweaks.

Calculate turn radius, diameter, circumference and turn rate, from bank angle and speed. Also find required bank for a given turn rate and speed. See turn radius instantly for any altitude/flight level and speed.

Thumbwheel/slider response is now much more natural and sensitive across all tabs.

Version 2 adds sunrise, sunset and civil twilight calculations for any location on Earth except directly at the poles. An editable database of locations is also included, with the ability to export and import locations. Help text display has been redesigned and substantially expanded.

Minor improvements on the Wind tab. Eliminated the needless requirement for the distance (or the time) to be "locked" in order to be able to change its value, when solving for groundspeed. This made it seem like the time (or distance) thumbwheel was not responding to turns. Also, when solving for wind, fixed an inconsistency allowing values to be entered that would cause a wind speed of more than 350 Knots. Subsequently switching to solve for heading or groundspeed would prevent inputs unless the wind speed was first turned back down to 350 knots or less.

Magnetic variation and fuel density thumbwheels are now taller, and easier to turn.

Now displays wind speed in feet-per-minute also. Minor visual changes.

Minor appearance improvements to thumbwheels.