> The file updates every minute, if I do refresh the page I miss the
> SavePosition. How can I reload the new positions coming from the file
> but keep the SavePosition().

Don't refresh the page.   Use a technique called AJAX, commonly used
with the maps API, which keeps the existing map but allows you to do
something like -
fetch new data from server to browser
clear old overlays from map
put new overlays on map
do anything else you want, like setting a new centre/zoom or returning
to your saved position.

cheers, Ross K

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