Size max and budget for Mexico and Guatemala

I don't know much about Apple as we don't use their products - too many apps and programs do not work on Apple stuff - but Navigator I mention above may be on Apple though I do not know - they seem to update fairly often but I don't know of anyone who updates as often as OSM - so OSM does the updates and eventually the others get around to issuing an update for their program or app that uses OSM - I have no idea who is the fastest at getting updates sent out - OSM is only online as far as I know - you have to pick what you want to use and then download all the offline stuff to be free to travel to places where internet may not be available - our Samsung S7 has a microSD slot that I think can take up to either 64G or maybe even 128 - not sure - depends on your device and what it has and what it can handle - somethings cannot go to an SD - storage of lots of maps can be a problem but we have lots of room on our 32G SD - there are other apps out there that do maps - if you search you will find various app rating places that will tell what users think of all kinds of apps - I think I got Navigator because at the time I was looking it got the highest rating - I have not really compared - we mostly travel using our Garmin with the latest updates from them - and then with our old Streets & Trips which is still the most versatile map/GPS routing program I have seen even though it has not been updated since 2013 - it may not have the new roads but I can check OSM or whatever to see if there is something out there we need to know about - we use our handheld devices when in town to check where we are while walking around or out on a hike - never use it for vehicle travel - way to small to see and to hard to plan a route of many miles - lots of ways to find your way around - there are full computer programs that use OSM but I have not found one I can easily use to plan long routes with lots of waypoints -