Global Navigation Grid Code (GNGRID) is like a giant map that helps people get around the world. It uses a system of lines called longitude and latitude to create a grid over the whole Earth. Think of these lines like the lines on a piece of graph paper.
The GNGRID divides the Earth into small squares that are given unique codes, just like how your house has a unique address. This code is made up of a combination of letters and numbers, and it tells you exactly where you are on the planet.
If you want to know where a particular location is on the Earth, you can look it up in the GNGRID and find its unique code. This code can be used by pilots, sailors, and even hikers, to navigate through the planet.
In simpler terms, the global navigation grid code is like a giant address book for the whole world. It helps people find their way around the planet using a system of lines and codes.