Orbit Map vs CEN Exam Practice Test 2026

Orbit Map is a working atlas of everything humanity has left in orbit. Around 31,900 tracked objects, propagated on your device with the same SGP4/SDP4 model the industry uses, drawn on a real 3D Earth you can turn in your hands. Point it at tonight and it tells you when the Space Station crosses your roof. Search a name or a NORAD number and the orbit appears. Tap one group and ten thousand Starlink satellites light up at once. WHAT YOU CAN SEE • Every catalogued object: payloads, spent rocket stages and debris • Live positions from public orbital elements, computed offline on your device • Orbit paths, ground tracks and the horizon footprint of any spacecraft • Starlink, GPS, Galileo, GLONASS, OneWeb, weather satellites, debris shells • Altitude, speed, period, inclination, apogee, perigee, country, launch year • Filter and colour the field by object type, altitude, country or status • Detailed 3D models of real spacecraft families • Run time forward and back, or freeze the atlas and read it PASSES OVER YOUR HEAD • When the Station, Tiangong or Hubble crosses your sky • Rise, peak and set with azimuth and elevation for each pass • Sunlight and darkness checked, because a pass you cannot see is not a pass • Any place on Earth as your observing point, with its own time zone • Notifications before something flies over THE ACADEMY 54 lessons, more than eight hours, written for this atlas rather than borrowed from a textbook. Every lesson carries measured numbers you can verify in the inspector, the misconception it exists to correct, two things to do on the globe, a comprehension check and the vocabulary it introduces. Nine modules, from the first question to responsible interpretation: orbital mechanics. Reading element sets. Orbit families. Real missions. Observing the sky. The space environment. Debris and safety. Signals and navigation. Data literacy. Sourced from NASA, ESA, CelesTrak and Space-Track. ON EVERY SCREEN YOU OWN iPhone, iPad, Mac, Apple TV and Apple Vision Pro. Lesson progress, observing places and display settings stay together through iCloud. HONEST ABOUT WHAT IT IS Orbit Map propagates public General Perturbations elements. Accuracy degrades as elements age and can differ by kilometres. Pass timing uses geometric sunlight and a 10° horizon; weather and apparent brightness are not modelled, so a sunlit pass is an opportunity rather than a promise. This is an educational atlas. It is not a conjunction assessment tool, not a navigation aid, and not for antenna pointing. Every screen states which snapshot it is using and how old the elements behind it are, because knowing the age of your data is part of reading it. WHERE THE DATA COMES FROM Public GP elements from Space-Track.org and USSPACECOM, cross-checked against an independent CelesTrak set before any release ships. Positions come from a Vallado-compatible SGP4/SDP4 implementation verified against the published reference vectors. Catalogue updates are signed and every byte is checked before it replaces what you already have. PREMIUM The free atlas is complete and accurate: the whole globe, the entire catalogue, search, orbit paths, and passes for the Station, Tiangong and Hubble. Premium opens all 54 lessons, every constellation, the full Orbital Lens, seven-day forecasts from up to ten saved places, pass notifications, every spacecraft model, the time machine and iCloud sync. Subscription Terms: Payment charged to iTunes Account. Auto-renews unless disabled 24 hours before period ends. Manage in Account Settings. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Data provided by Space-Track.org and USSPACECOM. Validation data provided by CelesTrak, Dr. T.S. Kelso. Earth imagery courtesy of NASA.

Pass the CEN exam with 1,500 practice questions aligned to the July 2026 BCEN content outline. The app is free to download. Detailed rationales and Premium study tools require an In-App Purchase. CEN Prep is built for emergency nurses sitting the Certified Emergency Nurse exam. Study between shifts, lock in weak domains, and walk into a 3-hour, 175-item exam with a pacing plan. INCLUDED WITH THE FREE DOWNLOAD • Practice questions across 11 CEN content areas • Study Path Set 1 with full explanations • Today's Question with full explanations • Progress stats and attempt review PREMIUM FEATURES — IN-APP PURCHASE REQUIRED A purchase is required to unlock Premium. Premium is sold as an auto-renewable In-App Purchase (weekly or monthly) and includes: • Detailed rationales and explanations for every question • Unlimited practice across the full 1,500-question bank • Timed 175-question exam simulator (3 hours; 150 scored + 25 pretest format) • Practice modes: random, hardest, missed, and saved questions • Module tests, final test, and Ask AI 11 TOPICS 1. Cardiovascular 2. Respiratory 3. Neurological 4. Gastrointestinal 5. GU / GYN / OB 6. Mental Health 7. Medical 8. Musculoskeletal / Wounds 9. HEENT 10. Environment / Tox / Infectious 11. Professional Issues WHO IT IS FOR ED and ER nurses preparing for a first CEN attempt, recertification by exam, or a retake. Independent practice for working nurses — not a BCEN course and not a substitute for the official content outline. IN-APP PURCHASES Premium requires an In-App Purchase. Payment is charged to your Apple ID at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel in Settings → Apple ID → Subscriptions. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sites.google.com/view/sv56developer/privacy-policy DISCLAIMER Independent educational resource. Not affiliated with, endorsed by, or associated with the Board of Certification for Emergency Nursing (BCEN) or the Emergency Nurses Association (ENA). CEN is a registered trademark of BCEN. Official eligibility, fees, exam rules, and passing standards are published by BCEN at bcen.org. This app's practice target is not the official cutoff.