You can download google maps areas for routes that have weak or no signal prior to leaving or stop at a Macdonald's type place as they have free wifi. They remain valid for 30 days before needing to be updated (still work after 30 days but considered out of date). Open google maps on your phone, click on your profile icon and then click on 'offline maps' and then 'Select your own map'. You then move the map around and zoom in/out to select the area to download.....you can do multiple areas.
That’s a good tip about downloading the maps for off-line use.
Thank you and thank you for sharing how to do it.
I have made a slightly edited version a sticky.