A weapon training system comprising: a round that is insertable into a barrel of an indirect firing weapon ; a charge containing a first magnet (142-1) and a second magnet (142-2) and configured to removably attach to the round ; an electronic device ; and a magnetic sensor system that is insertable into or integrated with the round , the magnetic sensor system comprising: a plurality of magnetic sensors ; and a microcontroller communicatively coupled to the plurality of magnetic sensors , wherein the microcontroller is configured to perform operations comprising: receiving a proximity signal from at least one of the plurality of magnetic sensors indicating a proximity of the first magnet (142-1) or the second magnet (142-2) to the plurality of magnetic sensors ; determining, based on the proximity signal, that the charge is removably attached to the round ; generating an output signal indicating that the charge is removably attached to the round; and wirelessly transmitting the output signal to the electronic device , wherein the electronic device is configured to determine that a simulated firing of the indirect firing weapon is to be performed based on the output signal. a round that is insertable into a barrel of an indirect firing weapon ; a charge containing a first magnet (142-1) and a second magnet (142-2) and configured to removably attach to the round ; an electronic device ; and a magnetic sensor system that is insertable into or integrated with the round , the magnetic sensor system comprising: a plurality of magnetic sensors ; and a microcontroller communicatively coupled to the plurality of magnetic sensors , wherein the microcontroller is configured to perform operations comprising: receiving a proximity signal from at least one of the plurality of magnetic sensors indicating a proximity of the first magnet (142-1) or the second magnet (142-2) to the plurality of magnetic sensors ; determining, based on the proximity signal, that the charge is removably attached to the round ; generating an output signal indicating that the charge is removably attached to the round; and wirelessly transmitting the output signal to the electronic device , a plurality of magnetic sensors ; and a microcontroller communicatively coupled to the plurality of magnetic sensors , wherein the microcontroller is configured to perform operations comprising: receiving a proximity signal from at least one of the plurality of magnetic sensors indicating a proximity of the first magnet (142-1) or the second magnet (142-2) to the plurality of magnetic sensors ; determining, based on the proximity signal, that the charge is removably attached to the round ; generating an output signal indicating that the charge is removably attached to the round; and wirelessly transmitting the output signal to the electronic device , receiving a proximity signal from at least one of the plurality of magnetic sensors indicating a proximity of the first magnet (142-1) or the second magnet (142-2) to the plurality of magnetic sensors ; determining, based on the proximity signal, that the charge is removably attached to the round ; generating an output signal indicating that the charge is removably attached to the round; and wirelessly transmitting the output signal to the electronic device , wherein the electronic device is configured to determine that a simulated firing of the indirect firing weapon is to be performed based on the output signal. <EOS>