coordinates [specific point] Help understand

Would it make sense to use coordinate? Do you understand what I mean? A coordinate is a specific point on earth right?

1 Only about 10% of the coordinates [by coordinates I mean places the train goes through] on this train route has a 3G network. 90% of the time, you won't be able to get online [internet] while on the train.

2 If you so much a take a step left or right from a specific point, you will get different coordinates.

3 What are the coordinates to the spot where you buried your cash?

Thank you