It's a little confusing that the 10/2009 and 10/2011 S1 updates both display the version number as 2.1 when you turn on the device. However, if you choose the "i" icon, this version will display as 1.2.3488.

• You now cancel a previously suppressed (i.e., marked) transmitter during a multiple burial by pressing and holding the OK button for two seconds. Previous versions would cancel the suppressed transmitters with a quick press of the OK button. This change prevents you from accidently cancelling the previously suppressed transmitters.
• You can activate a new "deep burial" function by pressing the OK button when you are between 3 and 7 meters from the transmitter. This causes the S1 to display the "circular illustration" sooner.
• You can now personalize the start-up screen with your name, address, phone number, etc. That's handy in case you lose your transceiver (the Mammut Pulse also allows the startup screen to be personalized).

It's a little confusing that the 10/2009 and 10/2011 S1 updates both display the version number as 2.1 when you turn on the device. However, if you choose the "i" icon, this version will display as 1.2.3237.

• Faster display indication of the buried victims after switching to LOCATION by reducing the message "STOP-hand"
• Protection of the "MENU button" against unintentional operation (press and hold the MENU button for more than 2 seconds to call up the "MENU" function).
• Optimized sensitivity for the indication “transmitter is located in front / in the rear” (180°-indication)
• New hold function (inclination measurement)
• Further enhancement of accuracy
  • Precise localization even of old and defective transmitters with frequency deviations of more than +-80 Hz
  • Optimization and refinement of self test (transmitter, receiver,
    magnet sensors and battery capacity)