Add a SignalScript crayon to your Survival Kit
Specialized Operations
Silent, battery-free, and durable, SignalScriptIR gives law enforcement and first responders a covert way to mark scenes, routes, and victims when every second counts.
Officers and incident commanders can use IRC marks to identify search grids, secure perimeters, or tag points of interest visible to FLIR/SWIR/NVG-equipped aerial or ground assets without emitting radio or electronic signatures. Marks remain durable through weather and activity, reducing the need to re-mark and allowing teams to focus on rescue, evidence collection, or crowd control. The result is faster scene management, clearer coordination between units, and safer outcomes for responders and civilians alike.
Drone Retasking
IRC marks enable drones to detect, retask, and relay precise ground coordinates — silently and without batteries.
IRC marks are visible to FLIR, SWIR, and NVG drones, allowing operators to retask UAVs to image and relay exact coordinates. Marks are reusable, silent, and non-electronic, so teams can signal routes or victims without a detectable signature. The result: faster search cycles and safer coordination between air and ground assets.
First Responders
When every minute matters, SignalScriptIR™ helps rescuers see what the eye can’t.
The IRC Crayon creates lasting infrared marks that guide search teams using FLIR, SWIR, or night-vision equipment. Responders can mark debris, safe routes, or victim locations without light, sound, or electronics—critical when power and visibility are gone. Its reusable, weather-resistant design keeps the signal clear until every life is accounted for.
Boating, Hiking & Outdoor Enthusiasts
Whether you’re out on the water or off the grid, SignalScript helps you stay seen when visibility disappears.
Built for adventurers, boaters, and campers, the reusable IRC Crayon creates long-lasting infrared marks visible to rescue drones and aircraft. It works silently—no batteries, no signal, no setup—so you can mark your boat, trail, or campsite for search teams to find you even in darkness or fog. Compact, waterproof, and simple to use, SignalScript™ adds an invisible layer of safety that could make all the difference when help needs to find you fast.
What is SignalScript?
SignalScript are passive, infrared-detectable crayons that leave visible, glowing markings (under the right technology). The crayons are created for multi-use purposes, from personal safety to organized Search-and-Rescue or Recovery efforts, useable in multiple climates and writable on multiple surfaces.
Designed with safety in mind, SignalScript crayons are intended to keep you and your teams aligned and safe at work and at play.
Introducing the SignalScript family of Crayons
Built for endurance across every environment
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Compliments PLBs
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Reusable & Long-Lasting
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Compact in Size
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Writes on Rocks, Trees, Fabric and even Metal
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No Batteries Required
Who is SignalScript is For?
Hunters, Trackers, Trappers and Ranchers - Wet or Dry Ops crayons (NVG compatible)
Mark your game trails during the day and track easier at night for nocturnal animal movements.
Hikers, Boaters and Outdoor Enthusiats - FLIR Search+Rescue crayon (Thermal infrared)
Intermittently mark your route as you hike- trees, rocks, downed logs. Thermal imaging leaves a visible trail for faster location should you need to take shelter in an emergency.
Search-and-Rescue or Recovery teams and personnel - FLIR Search+Rescue crayon (Thermal infrared)
Use in low-visibility environments to mark debris, unstable structures, ingresses, egresses and safe pathways.
Special Operations Teams - SWIR Overwatch
Mark your environment under radio silence and light discipline
Mark. Signal. Survive.
Search and Rescue (FLIR)
The Search & Rescue FLIR Crayon™ is a patent-pending infrared marking tool designed to enhance visibility for ground and aerial responders in smoke, darkness, and debris-obstructed environments. Its heat-responsive compound creates marks detectable by FLIR and thermal imaging systems, enabling faster location tracking and coordination during critical rescue operations.
Precision Marking for Low-Visibility Operations. Overwatch (SWIR/FLIR)
The “Overwatch” SWIR Crayon Formula™ is engineered for enhanced visibility under short-wave infrared imaging systems used in reconnaissance and aerial overwatch operations. Its specialized compound produces crisp, high-contrast markings detectable by SWIR-equipped drones and sensors, enabling silent coordination, route identification, and covert signal marking in complex mission environments.
Where Every Mark Matters.
Wet Ops Ready (NIR-940)
The Wet Ops Ready (NIR-940) Crayon Formula™ is built for maritime, coastal, and rain-soaked environments where standard infrared tools fail. Engineered with a hydrophobic compound tuned to the NIR-940 wavelength, it delivers long-lasting, high-contrast marks visible under NVG and near-infrared systems—because in the field, every mark truly matters.
Heatfield Signal Tech.
Dry Ops (NIR-940)
The Dry Ops (NIR-940) Crayon Formula™ is designed for desert, arid, and high-temperature operations where visibility and endurance are critical. Its advanced NIR-940 compound withstands extreme heat and dust, producing clear, durable infrared markings visible to NVG and thermal optics—Heatfield Signal Tech built for the harshest terrains.
What Industry professonals say
"The utility of an durable, easy-to-carry infrared marker is easy to see.
As a Hurricane Katrina survivor, such a tool would be very useful in disaster recovery operations, for both survivors and recovery personnel."
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Thinks F3 Overwatch could be useful in drone retasking.
CEO and Co-Founder, The ASBC
High-Confidence Market Opportunity Assessment:
Novel infrared marking technology addresses clear gap in existing electronic-only IR market. Multiple federal pathways available across defense, homeland security, and civilian search/rescue applications.
Adam Holmes
Outdoor Enthusiast
This infrared-detectable marking crayon is a fantastic tool for hikers, boaters, and rescue teams who need a reliable, temporary way to mark trails, routes, or gear. It writes easily on most surfaces, leaves a subtle mark that’s visible under IR for up to 72 hours, and is tough enough for field use without smearing or fading too quickly. Perfect for navigation, short-term wayfinding, or emergency coordination, it’s lightweight, easy to carry, and disappears naturally over time. A smart, eco-friendly alternative to paint or tape for outdoor and professional use.
Product Development
Provisional Patents Filed
In August 2025, two provisional patents we filed with the USPTO for the marking tools, known as the SignalScript family of Crayons
Civilian Community
Interested in the personal safety navigational crayon? Stay informed about product development and how you can help fund this mission.
Funding
Opportunities
Join us in our mission to improve emergency response capabilities; we are seeking collaborative efforts for ongoing development.
Safety Solutions
The IRC Crayon™ is designed for extreme efficiency. Its silent operation is perfect for covert missions where every mark can make a difference.
Future of Rescue
Discover practical applications of our technology in diverse fields, including law enforcement, firefighting, and humanitarian efforts, showcasing its versatility.