I had no issues (that I know of) with cross browsers. With the map giving weird results, you have to place your map "center" location n the local.config file. Then to actually zoom you need to change the parameters in the acars.js file as shown prior, catch is... those numbers have to fit both the map window you are using as well as the map from google, hence the long extensions behind the decimal. These have to be calculated for your map if it is sized differently than the default VMS map.