> Is the a way to prevent the screen moving to the center where you have
> double tapped

Double tap usually mean "zoom" with Mobile Safari.

>
> I have tried using preventDefault() on the whole document but that
> causes me problems elsewhere
>

If you want to design an webapp meant to work on iOS devices you
should use the "viewport" meta tag to constraint the behavior of your
pages.
For instance:

<meta name="viewport" content="width=device-width; initial-scale=1.0;
maximum-scale=1.0; user-scalable=0;" />

This will prevent zoom whether using double tap or pinch.

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