When the map is fully downloaded and saved you are ready to use it while offline.
Note: this is the procedure for iOS. You can download offline maps to android phones as well. The process is almost the same: you choose an area, choose the menu, look for save map offline, it will ask you to save the map, it will confirm the map is saved and ask you to name it. To find the map you will need to go into your profile by clicking the person icon on the homepage in the app. Once in that menu, find the offline map section and click on it to find a list of maps you have saved.
It is always in your best interest to have a paper hard copy of a map when you are in a remote territory. Yes, they do still make those, and yes, you can buy them in stores or even online. Many a park ranger and outdoor rescue worker use paper maps and even help those who find themselves lost with them.
Maps issued by Parks and Recreation/The Forest Service/The Bureau of Land Management will give detailed info on the conditions of all roads during certain times of the year. If a road is prone to becoming washed out or blocked there will be a side note to make travelers aware and suggest an alternate route. This is a feature you won’t find on a map saved to a phone, So having a paper copy map of your remote location is always a good plan.
Boondocking (RV camping unplugged in a remote area) is a fun and amazing way to experience some beautiful destinations. Make sure you have an emergency kit, you let people know your travel plans, and you are sure you know how to get around in the area with reliable maps.