Quantity   Component name
1 × ESP32 An ESP8266 can be used instead but the UART pins must be re-assigned
1 × SSD1306 OLED Display Any I2C display
1 × Ublox Neo 7M GPS Neo 6M or ATGM336H can be used
4 × LEDs Status lights
4 × Buttons For changing modes, navigating menus, changing settings, power off
1 × PNP transistor For toggling GPS module power