The GP-Probe NANO L1 is a compact GNSS jamming detector that helps you quickly identify interference in the GPS L1 band. The device is very easy to use — it has only one button and a LED scale that shows the interference power level in real time. All you need to do is switch it on, and it will immediately start beeping and vibrating whenever a jammer is detected.


The GP-Probe NANO L1 has two operating modes: Detector Mode and Logger Mode. From the factory, the device is set to Detector Mode by default.


1. How to Check Device Status


You can easily check whether the device is working and determine its current mode by looking at the lowest LED on the scale:

  • Blinks once per second → the device is active in Detector Mode.
  • Blinks once every 3 seconds → the device is active in Logger Mode.
  • No blinking → the device is switched off.

This simple indication makes it possible to confirm the device status at any time without connecting to a smartphone.


2. Powering On and Off


The GP-Probe NANO L1 is controlled with a single button. Turning the device on or off is very simple:

  • To switch on
    1. Quickly press and release the button.
    2. Then press and hold the button again for a couple of seconds.
    3. The LED scale will light up from bottom to top — this means the device is powering on.


  • To switch off
    1. Quickly press and release the button.
    2. Then press and hold it again.
    3. The LED scale will light up from top to bottom — this means the device is shutting down.


This visual animation on the LED scale helps you immediately understand whether the device is being turned on (lights grow upward) or off (lights fall downward).


3. Using the GPSPATRON Connect App


For more detailed data analysis and configuration, you can use the GPSPATRON Connect application. It can be installed on any Android smartphone. The detector connects to the phone via a USB Type-C port.

When the GP-Probe NANO L1 operates in Detector Mode and is connected to the app, you will see:

  • A real-time power graph of interference measurements.

  • GNSS signal quality indicators (SNR) coming from your smartphone’s GNSS receiver.

This allows you to analyze data more conveniently and quickly localize the source of interference.


Inside the app, you can configure the following parameters:

Threshold (dBm)

Sets how sensitive the detector is.

  • Example: if set to –90 dBm, the detector will trigger when interference is stronger than this level.

  • Lower (–95) = more sensitive, detects weaker signals, but may cause false alerts.

  • Higher (–85) = less sensitive, useful near industrial noise.

Recommended starting value: –90 dBm.

Alert Duration (seconds)

Defines how long the alert remains active after interference is detected.

  • Even if the interference disappears, the LEDs, vibration, or sound will stay active for the set time.

  • Example: if set to 10 sec, the alarm continues for 10 seconds after detection.

Notification Type

  • LED Scale – always active, shows interference power from weak to strong.

  • Vibration Alert – discreet notification (good for silent use).

  • Sound Alert – short beep when interference is detected.