PulseLink  //  by APD Defense

Casualty care that works off the grid.

PulseLink puts triage, MARCH treatment, the 9-line MEDEVAC and who’s-where on one Android screen, paired with an encrypted AES-256 radio link that needs no cell towers and no internet.

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IN ACTIVE DEVELOPMENT · EARLY ACCESS OPEN

  • AES-256authenticated encryption
  • 915 MHzsub-1 GHz ISM band
  • 0cell towers or servers needed
  • 4triage categories
  • 13built-in training scenarios

PulseLink · medic triage app, by APD Defense
Illustrative trace — not live data

01  /  The problem

When the signal drops, the casualty picture falls apart.

Cell coverage ends where a lot of hard work begins. Casualty information ends up split across radio calls, notebooks and memory, right when a medic has the least time to pull it together.

NO SIGNAL

No towers, no internet

In the backcountry, underground, or anywhere the infrastructure is down, phones lose their data link. Apps that lean on the cloud stop helping.

SCATTERED

Information in pieces

Who’s hurt, how badly, what’s been done and where they are lives in different heads, radios and scraps of paper.

HANDOFF

Every handoff costs time

Building and reading out a MEDEVAC request by hand is slow, and easy to get wrong under stress.

02  /  The PulseLink system

One app. One encrypted radio. No infrastructure.

PulseLink is two parts designed to work as one: an Android app built around how medics triage, and a wearable APD Defense radio that carries team data on its own encrypted sub-1 GHz link.

The PulseLink app

Android · works offline

Triage, treatment, the 9-line and a heading-up plot of where everyone is, all on one screen. No accounts, and your team’s data stays on your devices and the radio network.

  • Four-category triage board with a live tally and filters.
  • MARCH checklist and a 9-line MEDEVAC builder.
  • Built-in training mode for realistic practice.

The APD Defense radio

Sub-1 GHz · AES-256

A wearable data radio for places the phone network doesn’t reach. Every packet is authenticated, and its contents are encrypted.

  • AES-256 authenticated encryption; tampered and replayed packets are rejected.
  • Carries Cursor-on-Target, the format ATAK speaks.
  • Designed to relay traffic across a team mesh and to scale.
  • Casualty telemetry format ready for sensor integration.

How the data flows

From the medic’s hands to the leader’s map.

  1. HOP 1

    Medic’s phone

    PulseLink app

    Triage, MARCH and the 9-line are built here.

    → USB to the radio

    Demonstrated
  2. HOP 2

    Medic’s radio

    APD Defense radio

    Authenticates every packet and encrypts its contents. Keys are loaded into the radio over a cable, never over the air.

    → AES-256 · 915 MHz

    Demonstrated
  3. HOP 3

    Team radios

    Encrypted mesh

    Relays traffic across the team, verified at 2 and 3 hops on a four-radio bench.

    → Cursor-on-Target

    Demonstrated · via PC bridge
  4. HOP 4

    Leader’s ATAK

    ATAK-CIV

    Team positions carried by the radios show on the leader’s ATAK map. Sending the 9-line into ATAK is built; its test is next.

Tags show what has been demonstrated on development hardware today.

03  /  Features

Everything the medic needs, on one screen.

Demonstrated on development hardware; body-worn vital-sign sensors are on the roadmap.

AES-256 · sub-1 GHz

Encrypted radio link

Your team’s data moves over its own encrypted radio link. No cell service or internet required. Tampered or replayed packets are rejected.

Immediate · Delayed · Minimal · Expectant

Triage board

Every casualty in one of four categories, with a live tally and one-tap filters. Each category has its own shape as well as its color, so the board reads at a glance.

M · A · R · C · H

MARCH checklist

Tick through the MARCH sequence for each casualty. It’s the medic’s own record and memory aid, so nothing gets lost when you’re working several at once.

9-line · large-type read-off

MEDEVAC builder

PulseLink drafts the 9-line from what it already knows. You confirm every line, then read it over the net from a large-type card, one line per row.

Your GPS · your compass

Heading-up tactical plot

Up is the way you’re facing. Pick a casualty and see their range and bearing, then turn toward them and go. No data connection needed.

USGS topo · downloaded in the app

Offline topo maps

Pick your area, choose the zoom levels and see the size before anything downloads. It shows progress, and picks up where it left off if the signal drops. USGS topo covers the US; elsewhere you prepare tiles on a PC and copy them over.

Download before you go, not during: once you’re out, the map needs no network at all.

Cursor-on-Target

ATAK interoperability

The radio carries Cursor-on-Target, the format ATAK speaks. On the bench, two phones running ATAK-CIV showed each other’s positions across two APD radios, with a PC bridging each phone to its radio.

QR scan · 8-digit code

Set up radios by sticker

Every radio carries a sticker. Scan its QR code or type its 8-digit code to assign it to a team member. It works offline, with no numbers to manage.

No accounts · no analytics

Your data stays yours

No analytics, no automatic crash uploads, no update checks, no accounts. Positions, casualty records and 9-lines stay on your devices and the radio network. The apps use the internet only to load map tiles before you go and to send a problem report you choose to send.

True-black display

Dark by design

A pure-black interface built for OLED screens, where black pixels are switched off. The screen stays dim at night and easy to read in a hurry.

Training mode · 13 built-in scenarios

Train like it’s real.

Thirteen built-in scenarios, from a healthy baseline and minor injuries to a multi-casualty IED. Casualties change over time and some get worse. Simulated casualties are placed around your real position, so trainees walk out and find them. Everything simulated is clearly marked as training.

See it in a demo Read the specs

04  /  Who it’s for

Built for teams that work beyond the network.

Tactical medics & military medical teams

Triage, treat and call in the MEDEVAC from one screen, with ATAK in the loop.

Search and rescue

Keep the casualty picture together deep in terrain with no coverage.

Wildland fire

Track injuries on the line when crews are far from a tower.

Law-enforcement tactical EMS

Give the medic behind the team a clear, shared triage picture.

Remote & expedition medicine

Structured casualty care for trips beyond the reach of a phone signal.

Training schools & exercises

Run repeatable casualty scenarios that play out in real time, on the ground.

05  /  How it works

Three steps from injury to handoff.

  1. 01

    Clip on the radio

    Each team member carries an encrypted APD Defense radio. There are no towers, accounts or internet to set up.

  2. 02

    Triage on one screen

    Sort casualties into four categories, work the MARCH checklist and see who’s where on the heading-up plot.

  3. 03

    Hand off fast

    Confirm the 9-line PulseLink drafted, read it over the net from the large-type card, and share positions with ATAK.

06  /  Tech specs

The details.

Development hardware and the current PulseLink build. Specifications may change before release.

APD Defense radio

Band
915 MHz ISM · sub-1 GHz
Modulation
2-GFSK · 50 kbps
Encryption
AES-256-CCM, authenticated
Replay protection
32-bit counter · sliding window
Largest message
1,024 bytes, fragmented and reassembled
Infrastructure
None: no towers, internet or cloud
Interoperability
Cursor-on-Target · ATAK-CIV via PC bridge
Mesh relay
Bench-verified · 2 and 3 hops
Vital-sign sensors
Roadmap · format ready

PulseLink app

Platform
Android
Network use
Map tiles, loaded in advance, and problem reports you send; no accounts
Offline maps
USGS topo (US) in the app · OSM-derived via PC tool, credited
Map downloads
Area, zooms, size estimate, progress, resume · off by default
Map size
About 25 KB per tile; a county at zoom 12–15 is roughly 50–150 MB
Triage
4 categories · live tally · filters
Treatment record
MARCH checklist
MEDEVAC
9-line builder · large-type read-off card
Navigation
Heading-up plot · handset GPS + compass
Radio assignment
QR scan or 8-digit code, offline
Training
13 built-in scenarios, clearly marked
Display
True black, for OLED screens
Send 9-line as CoT
Built · end-to-end test next
Key loading
In CommandLink · USB cable

FCC notice: This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained.

IN ACTIVE DEVELOPMENT · EARLY ACCESS OPEN

Be among the first teams to put PulseLink in the field.

Book a demo, or join early access and help shape what ships.

Joining early access registers your interest only. It is not an order and no payment is taken. We will not sell or deliver radios until the required FCC equipment authorization is obtained.

Request a Demo Get Early Access

07  /  Contact

Let’s talk.

Tell us about your team and what you need. We’ll get back to you.

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Your team, what it does, and what you’d like to see. Up to 1,500 characters.

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