How can I make a navigator like the one pictured below with a cross in the center

[Whao510]

[iangilman]

We don't have a mechanism for that, but you can probably write something that would add it. Here's where the navigator rectangle is positioned; hopefully that can give you some ideas:

openseadragon/src/navigator.js

Line 408 in f3a942c

var style = this.displayRegion.style;