Generally we need to pause the game and see in MAP to check where we are or we can also use /location command.Their is an easy way for this also.A CLEO mod which display the name of zone above your HUD,it is useful when you are got cooldown for /location command.
GTA 5 was launched with a feature that its minimap was rectangular.I provide a mod which change your circular radar of GTA SA to Rectangular radar.Below is a screenshot how it looks like.