Geo mapping in Blogger.com

Hi Guys,
Myself and two others are planning a road trip from UK yo Kazakhstan via the high pamir mountains this summer. I have set up a blog on blogger.com Our blog must be able to update via sms. I have sorted that. The one thing I want to do is and a map to geotag out progress as we go and for the map mto draw lines between the points as we travel. I have been able to add html/java maps but they don't have the capability of us dynamically updating them within the blog. Cant use wordpress as we want to send sms updates. Wordpress allows sms/mms updates via an email address but we need to be aware of the data costs as we will be in the "sticks" when wer get to the "Stans". Does anyone know where I can get a map to embed as a widget to do what I need?

Cheers guys hope this makes sense:confused: