1. Aerosemi Technology Co.,Ltd, 2012. MT3608: High Efficiency 1.2 MHz 2A Step Up Converter. Available from: https://www.mikrocontroller.net/attachment/212877/MT3608.pdf.
2. Atmel, 2013. 8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash. ATmega162, ATmega162V. Available from: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2513-8-bit-AVR-Microntroller-ATmega162_Datasheet.pdf.
3. Bonnor, N., 2012. A brief history of global navigation satellite systems. Journal of Navigation, 65(1), pp.1–14. Available from: https://doi.org/10.1017/S0373463311000506.
4. Downloads Simcom.ee, 2019. Available from: https://simcom.ee/documents/?dir=SIM800L.
5. Dubinin, M., 2006. Calculation of distance and initial azimuth between two points on the sphere. Available from: https://gis-lab.info/qa/great-circles.html.