E6B Pilot Flight Computer vs Ringa

Catch a bad crosswind or leg-time assumption before engine start. E6B Pilot Flight Computer helps student pilots, CFIs, and other manual-planning pilots turn runway wind checks, wind previews, and nav-log cards into a faster preflight and teaching workflow without opening a full EFB. Use the free core to: - check runway crosswind plus headwind or tailwind components from manual wind and runway inputs - check density altitude from pressure altitude and outside air temperature before opening aircraft performance tables - preview wind correction angle, heading, and groundspeed from true course, true airspeed, wind-from direction, and wind speed - keep the workflow fully offline with no account, ads, or live EFB scope Unlock Nav-Log Cards to: - turn a wind leg into a full nav-log card with heading, groundspeed, leg time, and fuel required before reserves - save, pin, and reload local training or preflight cards on iPhone or iPad - share a plain-language training summary for debrief, lesson handoff, or planning notes - unlock the full student-pilot and CFI drill-card library for repeat runway, wind, and leg-time practice Why pilots keep it: - catch a runway-component or leg-time mistake before engine start - practice manual E6B thinking without rebuilding the same math in notes, spreadsheets, or browser calculators - hand off a clean training or debrief card instead of rewriting numbers - stay focused on one review-safe manual planning job instead of a broad aviation suite Important: Results are planning and training references only. Always verify runway choice, performance, fuel reserves, and operational decisions with your POH or AFM, current conditions, and pilot judgment. This app is not FAA-approved avionics and does not provide navigation, live weather, charts, flight-plan filing, or aircraft integration.

Find your ring size on your phone, with a ring you already own or with your finger, and any bank card. No sign-up: ring sizing and the full result are always free. HOW IT WORKS 1. Calibrate once. Lay a bank card on the screen and match one line to its edge. Ringa learns the true size of your screen. 2. Measure. Place a ring that fits you on the screen and fit the circle to its inner edge. Smaller and Larger buttons fine-tune it by a tenth of a millimeter. 3. Read your size. The inner diameter in mm and your size in every common system, side by side. Not sure what to do? Each step has a short animation that plays the first time, and How? shows it again. NO RING AT HAND Switch to With your finger. Lay the finger flat on the screen and mark the width at its root and at the knuckle. Ringa estimates your ring size to within one size and says so on the result. When you can, check it with a ring. ONE MEASUREMENT, EVERY SIZE SYSTEM US and Canada, UK and Australia (letters), Europe (circumference), Japan, Switzerland, India, Türkiye and inner diameter in mm. Handy when you shop from a jeweler abroad. HONEST BY DESIGN A phone screen is not a jeweler's mandrel. Ringa always shows the millimeters, says a ring measurement is accurate to about half a size, and suggests the larger size when you land between two. Tips cover the rest: measure in the evening, warm hands first, wide bands need half a size up. SIZES FOR THE PEOPLE YOU LOVE Save a result to yourself or to someone else and find it again in Settings under People. Planning a proposal or a gift? Borrow one of their rings for a minute, measure it and keep the size for the day you shop. Share the result with the jeweler in one tap. PRIVATE No account. Your calibration, people and sizes stay on your phone. 16 languages. JEWELRY PACK One optional purchase opens more true-size tools: bangle size; a solitaire diamond at true size on your own ring size, from 0.25 to 2 carats; for watches, band (lug) width, wrist and bracelet size with a paper strip, and your watch at true size on your wrist; and My stone, your birthstone and zodiac stone at true size on your finger. Ringa is free and supported by ads. At most one full-screen ad may appear after you confirm a measurement, before the result. There are no ads while you calibrate or measure, and the result is never locked. Optional: the Jewelry Pack, a one-time in-app purchase, with bangle sizes and no full-screen ads. You can restore the pack on your other devices with the same Apple ID.