Here are my 2-cents.
We would forego all the asking for a "yes/no" inorder to print open the map in the browser and rather include a commandline arg to it instead. But if you stay with it, remember to rather use one letter; "y/n" to minimise the margin for error and also turn the given letter to one case ; lowercase, also take care of any case reply.
Another thing, since we all might not have the maxmind database on our systems, a download class for the database could do. Check a default location for the database, if empty or non-existent, check if a custom path for the database was provided [this is another flag to specify], if not provided, prompt them for your script to download it or just exit and tell then to include the download flag[another flag to include]. You could also have an update flag, i don't know how often the maxmind database is updated but checking for how old the database is and advising to update it would be nice.
Argparse should have taken care of the printing of the help message incase the args are not enough, in which case either the target flag should be made required.
I notice you only ask for IP addresses, how about someone provides a domain name and you take care of resolving the IP then do your magic. Just remember to tell me which IP of the domain you are using.
In argparse, the type value here wouldn't be needed as they are by default all strings. I would reck my brain about it if i needed an int or bool.
I was also wondering how i will exit the infinite loop after the browser opens, what is going to make the value true for it to exit!
This script doesn't include complex constructs that you actually could practice both; writing portable code for all systems and portable code for both python varieties, 2 and 3.
It would all be nice and dandy if you rolled a class or two for this. Nice project to practice on.
Anyway, thanks for the script. These are the projects i also thought about when i was first learning python.
Check this out for inspiration on that GUID problem:
https://github.com/fiorix/txtraceroute/blob/master/txtraceroute.py