Discovery

The Discovery screen is your card reconnaissance tool. It has three tabs: Detect, Collect, and Sniff.

Detect Tab

Quickly identify what type of card is on the reader.

Scan Modes

Button	Description
LF	Scan for 125kHz low-frequency cards
HF	Scan for 13.56MHz high-frequency cards
All	Scan both LF then HF

How to Detect

Place a card on the Proxmark3 antenna
Tap LF, HF, or All
View the detected card type and data
Tap the terminal icon to view raw PM3 output

Note: Detect is for identification only. To save cards, use the Collect tab or Targeted Read.

Supported LF Cards

HID Prox (all Wiegand formats)
AWID
Indala
EM4100
Pyramid
IO Prox
Gallagher
Securakey
PAC/Stanley
Nedap
Nexwatch/Quadrakey
G-Prox II
Paradox
Viking
Keri
Motorola
COTAG
IDTECK
Jablotron
Noralsy
Presco
Visa2000
FDX-B (animal tags)
Destron (animal tags)

Supported HF Cards

iCLASS (Legacy, SE, SEOS)
MIFARE Classic (1K, 4K, Mini)
MIFARE Ultralight (C, EV1)
MIFARE DESFire (EV1, EV2, EV3)
EMV (payment cards)
PIV (government ID)

Auto Key Extraction

For iCLASS Legacy cards with standard keys, ATLAS automatically attempts credential extraction to get FC/CN.

Note: iCLASS SE cards cannot be decrypted without keys. Card details can be extracted with Doppelgänger Core (R90SE) and Stealth devices if standard keys are used.

Collect Tab

Continuous card collection for passive reconnaissance.

Watch Modes

Mode	PM3 Command	Description
HID Prox (LF)	`lf hid watch`	Continuous read for HID cards
AWID (LF)	`lf awid watch`	Continuous read for AWID cards
EM4100 (LF)	`lf em 410x watch`	EM tag continuous read
Net2 (Paxton) (LF)	`lf em 410x watch`	Paxton Net2 with card number calculation

How to Use Watch Mode

Select a watch mode from the dropdown
Tap Start
Cards appear as they’re detected
Duplicates are automatically filtered
Tap Stop or press the PM3 button to end

Note: Watch mode runs continuously until stopped. If the stop signal doesn’t work immediately, remove the card from the reader.

Auto-Save

Enable Auto-save to current project to automatically save detected cards. Cards are tagged with:

Detection timestamp
GPS coordinates (if enabled)
Active project association

Auto-save only works when a project is active. The toggle is disabled by default.

Targeted Read

For specific card protocols, use Targeted Read:

Select card type from the dropdown
Tap Read
Place card on reader
Card data appears and can be saved

Supported targeted read types:

Type	Description
iCLASS	iCLASS Legacy with credential extraction
SEOS	HID SEOS cards
MIFARE Classic	MIFARE Classic 1K/4K
MIFARE Ultralight	MIFARE Ultralight variants
MIFARE DESFire	DESFire EV1/EV2/EV3
EMV	Payment cards
PIV	Government ID cards
HID Prox	LF HID Prox cards
AWID	LF AWID cards
Indala	LF Indala cards
EM4100	LF EM4100 tags
Net2 (Paxton)	Paxton Net2 cards

Sniff Tab

Capture RF communication between a card and reader.

Note: Sniffing can be temperamental and may produce inconclusive results. Position the device carefully between the card and reader. Multiple attempts and adjustments are often needed.

Supported HF Protocols

Protocol	Command
iCLASS	`hf iclass sniff`
MIFARE	`hf 14a sniff`
MIFARE DESFire	`hf 14a sniff`
EMV	`hf 14a sniff`
SEOS	`hf 14a sniff`
Topaz	`hf topaz sniff`
ISO14443-B	`hf 14b sniff`
ISO15693	`hf 15 sniff`
FeliCa	`hf felica sniff`

Supported LF Protocols

All LF card types use lf sniff -v:

LF Generic
HID Prox
AWID
Indala
EM4100
Net2 (Paxton)
Pyramid/Farpointe
IO Prox
Gallagher
Securakey
PAC/Stanley
Nedap
NexWatch
G-Prox-II
Paradox
Viking
Keri
Motorola Flexpass
COTAG
Idteck
Jablotron
Noralsy
Presco
Visa2000
FDX-B Animal Tag
Destron FDX-A

Trigger Options

Trigger options are available for ISO 14443-A cards only (MIFARE, DESFire, EMV, SEOS):

Trigger	Flag	Description
Card Trigger	`-c`	Capture when card approaches reader
Reader Trigger	`-r`	Capture reader-initiated communication

Both triggers are enabled by default. The sniff runs in interactive mode (-i) and blocks until you press the PM3 button.

How to Sniff (HF)

Select an HF card type
Configure trigger options (if available)
Tap START SNIFF
Position Proxmark3 between the card and reader
Badge normally
Press the PM3 button to stop capture
Tap VIEW RESULTS to decode the captured trace

How to Sniff (LF)

Select an LF card type
(Optional) Tap LF SETTINGS to configure trigger threshold
Tap START SNIFF
Position Proxmark3 near the reader
Badge the card
Sniff completes automatically when buffer is full
Results are auto-decoded with lf search -1

Saving Traces

After sniffing, enter a filename and tap SAVE TRACE:

Frequency	Command	Extension
HF	`trace save -f filename`	`.trace`
LF	`data save -f filename.pm3`	`.pm3`

Saved files can be accessed via Settings → File Manager → Traces.

Viewing Saved Traces

LF .pm3 files can be opened in the Waveform Viewer for manual signal analysis (File Manager → long-press file → View).

Saving Cards

Cards are saved from the Collect tab:

Use Watch Mode or Targeted Read to detect cards
Tap a detected card tile to open the save dialog
Select a project and add optional notes
Card is saved with GPS coordinates (if enabled)

Alternatively, enable Auto-save before starting Watch Mode to save cards automatically.

Card Actions

After targeted read completes, a save dialog appears automatically. From there you can:

Action	Description
Save	Add to database with project and GPS
Cancel	Dismiss without saving