Hello. I tried to remove marker when firebase data changed form this block but when data changed. It add new marker form new data (latitude,longitude) but old mark is not remove. Then I change form remove marker when data changed to when button click for find way to finish. But it be on this video.
This is block.
Thanks you.
Use this block
Yes. I tried to use this block but result be my video. A marker just blink but not remove when button click.
In block when Clock1.Timer add set Clock1.Timer Enabled to false and see if it works for you
It so work. Thank you so much.
If problem solved mark solution in order to help others with similar problem 
OK I marked this topic and old my topic. 
Excuse me. I have problem again. First I add set Clock1.Timer Enabled to false in block when Clock1.Timer as you said it work. But now it be problem like in video agian. 
This too. It not work.
what is the timer interval you set? it needs minimum two or three seconds?
Set it like this
Now I can solved problem.
I’m clear value in list.
Thank you.
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