First of all you need to know that this application requires Wheres my droid. It can be downloaded from the market: https://market.android.com/details?id=com.alienmanfc6.wheresmyandroid&feature=search_result
With this application you can manage multiple mobilephones with different trigger words. When the trigger word i sent just wait and the application will intercept the incomming sms with the coordinates and launch google maps for you with the target location. The application remembers the last search.