This article explains how to use Apple Maps offline on your iPhone. Instructions apply to devices running iOS 17 and later.
How to Use Apple Maps Offline (Tutorial)
Here’s how to use Apple Maps offline. Keep in mind that offline maps use a lot of data, so it’s best to download them when you have a Wi-Fi connection. You may need to free up some space first, depending on how big an area you want to cover with your offline maps.
Open Apple Maps on your iPhone.
Tap your Apple ID picture.