RPN vs Pilot Checklists

A dream calculator of the mid-70's, priced at $2,500 in today's dollars (2025), right on your iPhone! RPN-67 SD is the iPhone version of RPN-67 Pro, the first complete simulation of Hewlett-Packard's legendary HP-67 programmable calculator for the iPad. Produced from 1976 to 1982, the HP-67 was a huge success among scientists, engineers and other professionals. Thousands of programs were written for it. Now you can run them right on your iPhone, with more ease and faster than ever before. To get you started quickly, run the built-in program cards, or choose from the large number of programs available as free downloads from our website. What users said: “This version permits you to use your virtual HP-67 just as you could the original – hand-held and highly portable. Congratulations to the developer for providing such an excellent and aesthetically pleasing software product." "This was my first scientific calculator in real life. It is great to have the simulator on my iPhone. The special features added make it into a HP-41 or 42S! It comes packaged with some great samples. Am having great fun with it." Features: • Virtual program and data cards • Virtual paper tape printer supports all HP-97 printer modes • Powerful database-driven card manager • Create, label, and organize a virtually unlimited number of cards • Use iTunes to effortlessly save entire card collections on your Mac/PC • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • Editable listing shows labels, targets of branches, and errors • E-mail listings and let the recipient paste the text right into RPN-67 • Print listings on any AirPrint-compatible printer • Program listing on paper tape shows subroutine nesting • Edit paper tape • E-mail paper tape, or print it via AirPrint • Cut/copy/paste displayed value or program steps • Paste existing HP-67 listings into RPN-67 SD and run them • "Live" display of stack, memory registers, flags • Show and edit program instructions • Fast: 1.5 seconds vs. 6 minutes (program HM-05, determinant of 5x5 matrix) • Low-battery indicator (iPhone charge 10% or less) • Optional high-contrast mode for working in bright ambient light • Compatible with RPN-67 Pro and RPN-97 Pro While RPN-67 SD works like a real HP-67, changing a simple setting will turn the app into a super-charged HP-67: • Up to 999 program steps, 8 subroutine levels, 6 additional flags (F4...F9) • 100 additional registers • 100 additional labels • 100 built-in constants and conversions • More than 150 additional powerful operations and functions Plus: • 15 commands to print and manipulate any range of extended registers • Unrestricted register arithmetic • Exchange x with any register • Complex numbers, hyperbolic functions • Non-volatile memory - stack, registers, program, flags, paper tape • Status indicators for prefix keys (f, g, h, STO, RCL, etc.) • Display showing thousands separators (optional) • Text output on simulated paper tape in 10 colors, even simple plotting • Stack-of-stack: push/pop the entire stack on internal stack (4 levels) • Single-step into subroutines (optional) • Powerful debugging aids, including 10 breakpoints with counters • Keycodes translated to command names while entering or single-stepping a program • Change the duration of the PAUSE command • Compress constants in programs into a single step (reversible) RPN-67 SD comes with more than 130 programs pre-installed, including HP Standard Pac, HP Business Decisions Pac, HP Math Pac I, HP Stat Pac I, and HP Surveying Pac I. The simulator has been verified to correctly run the examples given in HP Civil Engineering Pac I, HP Clinical Lab Pac, HP E.E. Pac I, HP Games Pac I, HP M.E. Pac I, HP Navigation Pac I, as well as large number of programs published in Users' Library Solutions. For more information and free program downloads visit the RPN-67 website: cuveesoft.ch/rpn67

Checklists - Fly Smart helps pilots carry organised, aircraft-specific procedures on iPhone and iPad — structured the way you already think: Normal, Abnormal, and Emergency. Core checklist flying stays free and works offline. No account required to build planes and run sessions. MY PLANES • Build a personal fleet — each aircraft has its own checklists and reference cards. • Add a photo so your planes are easy to spot on the home screen. • Start from built-in or community templates, then tailor procedures to how you fly. • Choose an aircraft icon and an accent color so each plane is easy to tell apart. IN THE COCKPIT • Walk procedures step by step; tick items off as you go. • Jump quickly between abnormal and emergency sections when time matters. • Active sessions keep progress across procedures — and survive if you leave the app or restart the device. • Takeoff and landing clocks in the session banner; finished flights appear in session history. • Layouts tuned for phones and tablets. • Optional flight-path recording during an active session (on by default). The track, distance, and speeds appear on a map in session history; export as GPX or KML. GPS altitude is not pressure altitude. FLIGHT SCRATCHPAD • ATIS, clearances, frequencies, and quick notes with stylus or finger — right from an active session. • Free: one page during a flight (not kept after the session ends). • Premium: multi-page pads, saved notebooks under Tools, open a notebook into the flight pad, archive notes with session history, and export as PDF or PNG (light or dark paper). COMMUNITY TEMPLATES • Browse starter and manufacturer-style templates without an account. • Import what you need, then edit locally to match your POH and club SOPs. BACKUP & SHARE • Import a signed .plchk backup from Files, AirDrop, Mail, or another pilot (free). • Premium unlocks .plchk export and PDF quick-reference for briefing packs. • (Beta) Import / Export to avionics and navigations (Garmin gplt, ace, Dynon, ForeFlight and others) PREMIUM (ONE-TIME UNLOCK) • Pilot Tools offline: wind/crosswind, density altitude, airspeed (CAS/EAS/TAS/Mach), units, time, METAR glossary, ICAO phonetic alphabet. • E-ink style high-contrast theme for readable cockpit reference. • Cloud backup and sync across your devices when signed in. • Never locks Normal, Abnormal, or Emergency checklist execution. SETTINGS • English and Czech. • Light, dark, or system theme; aviation display units for tools. PRIVACY BY DESIGN • Local-first: your planes and checklist data live on your device. • Sign-in is optional — email, Google, or Apple — and is only needed for cloud sync, voting, publishing, and cross-device Premium. IMPORTANT Checklists - Fly Smart is a personal organisation aid. It does not replace your approved aircraft flight manual, POH/AFM, operator manuals, regulations, or training. You remain responsible for verifying every procedure against authoritative documentation and for safe operation of the aircraft. Community templates are starting points, not official sources.