 Players use melee attacks , firearms and explosives to fight enemies , and may run , jump , swim or use vehicles to navigate the world . To accommodate the map 's size , the game introduces vehicle types absent in its predecessor Grand Theft Auto IV , such as fixed @-@ wing aircraft . Auto @-@ aim and a cover system may be used as assistance against enemies in combat . Should players take damage , their health meter will gradually regenerate to its halfway point . Players respawn at hospitals when their health depletes . If players commit crimes while playing , law enforcement agencies may respond as indicated by a " wanted " meter in the head @-@ up display ( HUD ) . Stars displayed on the meter indicate the current wanted level ( for example , at the maximum five @-@ star level , police helicopters and SWAT teams swarm to lethally dispatch players ) . Law enforcement officers will search for players who leave the wanted vicinity . The meter enters a cooldown mode and eventually recedes when players are hidden from the officers ' line of sight ( as displayed on the mini @-@ map ) . 
