{"product_id":"sentinel","title":"Sentinel","description":"\u003cp\u003e✓ Instant download after purchase\u003cbr\u003e\n✓ Single HTML file — no install required\u003cbr\u003e\n✓ Runs in any modern browser: Windows · macOS · Linux\u003cbr\u003e\n✓ Free updates for 1 year from purchase\u003cbr\u003e\n✓ U.S. sales only at this time\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat is Sentinel?\u003c\/h2\u003e\n\n\u003cp\u003eSentinel is a live-refreshing Earth and space situational-awareness display built for operators, educators, preparedness users, and technical professionals who want a current picture of global activity — without the overhead of heavyweight systems.\u003c\/p\u003e\n\n\u003cp\u003eIt runs full-screen in a modern browser on Windows, macOS, and Linux. No server. No account. No installation. Open the file, set your local reference location, and you're operational in under 60 seconds.\u003c\/p\u003e\n\n\u003cp\u003eSentinel is a focused situational-awareness tool for people who want authoritative public information at a glance: seismic activity, geophysical context, satellite visibility, grayline, and local reference conditions in one always-on display.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eIs Sentinel right for you?\u003c\/h2\u003e\n\n\u003ch3\u003e🌍 Situational Awareness Professionals\u003c\/h3\u003e\n\u003cp\u003eYou monitor global events, seismic activity, geophysical patterns, hazards, and environmental context. Sentinel pulls authoritative public data sources and renders them clearly on a single operational display.\u003c\/p\u003e\n\n\u003ch3\u003e🎓 Educators \u0026amp; Outreach\u003c\/h3\u003e\n\u003cp\u003eYou run demonstrations, classroom displays, public outreach, or training sessions. Sentinel works on any screen, needs no IT setup, and presents a live public-data picture of Earth and space that engages any audience.\u003c\/p\u003e\n\n\u003ch3\u003e🛰️ Radio \u0026amp; Satellite Operators\u003c\/h3\u003e\n\u003cp\u003eYou track ISS passes, monitor satellite visibility, or want orbital context relative to your location. Sentinel shows your local reference location — also called QTH by radio operators — with footprint coverage, AOS\/LOS timing, and satellite context without cluttering your workflow.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eKey Capabilities\u003c\/h2\u003e\n\n\u003ch3\u003eSatellite Awareness\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eISS and CSS always-on tracking with live latitude\/longitude and orbital status\u003c\/li\u003e\n\u003cli\u003eSAT 1 and SAT 2 — selectable from a curated satellite list\u003c\/li\u003e\n\u003cli\u003eFootprint rings, clear \"in-view\" indicators, and adjustable orbital trails\u003c\/li\u003e\n\u003cli\u003eAOS\/LOS timing for selected satellites based on your local reference location\u003c\/li\u003e\n\u003cli\u003eEmbedded TLEs at startup — upgrades to live CelesTrak data when online\u003c\/li\u003e\n\u003cli\u003eSatellite tooltips: apogee, perigee, lat\/lon, inclination, visibility status\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eEarth Activity\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCurrent earthquake activity from the USGS 24-hour global feed\u003c\/li\u003e\n\u003cli\u003eMagnitude-scaled markers with hover tooltips and event statistics\u003c\/li\u003e\n\u003cli\u003eStrongest quake, most recent event, event count, and most active region at a glance\u003c\/li\u003e\n\u003cli\u003eFeed status line: last updated, fresh\/stale\/offline indicator\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGeophysical Context\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUSGS curated volcano overlay — globally consistent markers with hover tooltips\u003c\/li\u003e\n\u003cli\u003ePB2002 tectonic plate boundaries for geophysical context\u003c\/li\u003e\n\u003cli\u003eBoth overlays are toggleable and settings persist across sessions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLocal Context\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReal-time grayline day\/night terminator — updates continuously\u003c\/li\u003e\n\u003cli\u003eLocal reference marker with weather snapshot and active NWS alerts where available\u003c\/li\u003e\n\u003cli\u003eGlobal city clocks for major time zones with UTC reference\u003c\/li\u003e\n\u003cli\u003ePersistent settings: your location and toggle states survive browser restarts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOperational Reliability\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLocal-first: Sentinel runs on your machine. Live feeds refresh when internet is available.\u003c\/li\u003e\n\u003cli\u003eOffline-capable: embedded TLEs and the cached volcano catalog keep working without connectivity\u003c\/li\u003e\n\u003cli\u003eUnified feed-status line showing which data sources are fresh, stale, or offline\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\n\u003ch3\u003eSystem Requirements\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrowser:\u003c\/strong\u003e Current versions of Chrome, Edge, Firefox, or Safari. Chromium-based browsers are recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOS:\u003c\/strong\u003e Windows 10+, macOS 11+, Linux\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 1080p or 4K recommended; other resolutions may work. Optimized for full-screen or dedicated second-screen use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternet:\u003c\/strong\u003e Optional for core display functions; required for live feed refreshes such as earthquakes, weather\/alerts, and TLE updates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall:\u003c\/strong\u003e None. Open the HTML file directly in your browser.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle self-contained HTML file (~1.1 MB)\u003c\/li\u003e\n\u003cli\u003eEmbedded TLE data for immediate orbital display\u003c\/li\u003e\n\u003cli\u003eUSGS volcano catalog (auto-refreshes when online, cached when not)\u003c\/li\u003e\n\u003cli\u003eBuilt-in help documentation (press H or F1)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLicense\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-computer, single-user license\u003c\/li\u003e\n\u003cli\u003eFree updates for 1 year from purchase, within the purchased version track\u003c\/li\u003e\n\u003cli\u003eU.S. customers only at this time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWorks alongside Guardian\u003c\/h2\u003e\n\u003cp\u003eSentinel pairs naturally with \u003ca href=\"\/products\/guardian\"\u003eGuardian\u003c\/a\u003e, our space weather, propagation, and signal-environment situational-awareness display. Each product runs independently as its own single-file app — many users run both side by side.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat happened to EarthView?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEarthView has been renamed to Sentinel. If you purchased EarthView, you own Sentinel. Your original download link remains valid for updates included with your purchase. Free updates are included for one year from your purchase date, within the purchased version track.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo I need an internet connection?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Sentinel runs locally from your machine. When internet is available, it refreshes live feeds: earthquake data, weather\/alerts for your location, and TLEs from CelesTrak. When offline, it uses embedded TLEs and the cached volcano catalog.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between Sentinel and Guardian?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThey serve different primary missions. Sentinel centers on Earth awareness: earthquakes, hazards, geophysical context, satellite visibility, grayline, and local weather\/alerts. Guardian centers on the signal environment: space weather, propagation, solar and geomagnetic activity, and satellite visibility. Both track ISS and CSS. Many users run both.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this on multiple computers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYour license covers a single computer and single user. If you need additional seats, contact us.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs there a refund policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes — see our \u003ca href=\"\/policies\/refund-policy\"\u003eRefund Policy\u003c\/a\u003e for details.\u003c\/p\u003e\n","brand":"The Earth Shack Software LLC","offers":[{"title":"Default Title","offer_id":50770862473522,"sku":null,"price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0964\/5676\/9842\/files\/sentinelv1.1_72739b3b-a95d-48d1-b734-5a3279c43e47.png?v=1783394984","url":"https:\/\/theearthshacksoftware.com\/products\/sentinel","provider":"The Earth Shack Software LLC","version":"1.0","type":"link"}