Three Map Tweaking Questions

Question One: I am trying to set the cent or the map which is different than the location of my antenna. Does it matter as far as accuracy? Is there a way to tell FA where my antenna is and where I want the map centered? I have set the center to other than my antenna location. It looks right but I want it to be right!

Question Two: I want to toggle the range rings off and on based on the zoom setting. Here is the function I have tried to guess at:

   // Maybe hide Range Rings
   if (params.get('ZoomLvl') >= 9) {
           setRangeRingVisibility(params.get(false));
   } else {                 
           setRangeRingVisibility(params.get('true'));
   } 

Obviously, I am not a JavaScript guy. Is the syntax close to being correct? Am I calling, checking, and setting values correctly? Where should I place this function so that it is called when the zoom lever changes?

Third Question: I want to use .5 increments I set the two range ring setting to 0.5. It works! But the labels are wrong. Looks some sort of function can only use integers so something is converting it. Thus I get labels that start with nm and end with 1,1, 2,2,3,3,4,4 instead of .5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5

Any thoughts on where to find the relevant code would be much appreciated.

John Ullom

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