That would be great thanks.... so far your the first to speak up and as mentioned have people asking as they want to start planning.
I have used Google Maps. Highly recommend trying to create a couple of maps on your own with Google as it took me a while to figure out how to use it. There are some good user forums that you search for answers to issues you may have that help a lot. They recently updated Google Maps and haven't use the new version so not sure what if anything has changed. There may even be a better option than Google Maps out there.
I could send you an email of the source map that I think should help get you started in creating your own 2015 map in your own Google account. If not I could just add you as a share on the one I have created and that will let you make changes etc.
As far as keeping it up to date goes - you need to look through the Rally
section of the forum to see what new rally's have been posted every couple of weeks or so. Unfortunately only a few of the meet organizers send a PM advising me of the details so you kind of have to search through the rally
section to see what you may have missed in so far as new rally or new info on a rally's location goes. Looking through the calendar on this site is another way as some (not all) post the rallys to the calendar as well. But don't worry to much about missing a rally as you will probable get a PM for the organizer eventually asking why their meet is not on the map? or why the map still shows original info posted if there has been a change in location dates etc since ;-)
Let me know if and when your ready to take it over.