After enabling GPS tracking in the app (from the Menu > Settings page) you location will appear on the map as a blue dot
Select any of the map pages from the app navigation bar at the bottom of the screen (Mobs, Paddocks or Tasks pages)
Select the target icon in the bottom right hand corner to zoom into your current location, which will be highlighted on the map as a blue dot.
Note: on android devices the zoom to your location button is in the top right hand corner of the map.
Move between blocks
Quickly move between blocks (if your farm has more than one block of paddocks) by tapping the zoom button, and tap again to zoom out to see all paddocks/block at once.