L80-M39 GPS 

Data Sheet:

https://www.mouser.com/datasheet/2/1052/QWSC_S_A0004134860_1-2576267.pdf

 

OLED Display 

Data Sheet:

http://www.hiletgo.com/ProductDetail/2157359.html

 

Arduino Nano 

Data Sheet:

https://docs.arduino.cc/hardware/nano

 

Buck Converter 

Data Sheet:

https://www.makerfabs.com/adjustable-mini-dc-dc-module-mp1584en.html#:~:text=Documents%3A-,Datasheet,-RELATED%20PRODUCTS