Calibration isn't set in stone. If a level's blue dot lands in the wrong place — or you've replaced the level image — you can re-position it, wipe its corners and start over, or nudge the coordinates by hand. This guide covers all three.
Re-position from where you left off
The quickest fix is usually to open the tool again and adjust. Expand the level on the GPS tab and click 📍 Position on map. If the level already has corners, the tool opens framed to them, with your image sitting where you last placed it — so you can nudge, distort or rotate to correct a small drift, then ✓ Capture corners again.
Clear a level and start fresh
If the calibration is badly off — or you've swapped in a completely different level image — it's cleaner to wipe the corners and position from scratch.
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Open the level
On the GPS tab, expand the level with Edit.
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Click Clear this level
Clear this level empties all four corner boxes and removes the ✓ GPS set badge. The level is now uncalibrated.
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Position it again
Click 📍 Position on map — with no saved corners, the tool starts you with a fresh box in the current view. Line it up and ✓ Capture corners.
Fine-tune the coordinates by hand
Each corner has its own Latitude and Longitude box — Top-left, Top-right, Bottom-left and Bottom-right. You can type or paste values directly, which is handy if a surveyor or architect has given you exact coordinates, or if you want to tweak a single corner by a few metres.
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Type into the corner boxes
Enter a decimal latitude and longitude for each corner (for example
-33.8688and151.2093). Southern latitudes and western longitudes are negative. -
Values commit as you type
The ✓ GPS set badge appears as soon as any corner has a value. Leave a corner blank and it simply isn't saved — so fill all four for an accurate dot.
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Save to publish
Unlike Capture, hand-typed changes don't auto-publish. Click Save & Publish so your edits go live.