The marker's vertical position was hardcoded (10dp below the label) — markerY never participated, so the dot could only move horizontally and could not reflect where the GPS fix sits inside the 4-char square.
Now the marker is positioned in both axes from the cell's top-left corner:
- x = markerX * cellWidth, y = markerY * cellHeight (screen Y)
- markerX/markerY come from the 3rd character pair via the reference lookup tables (lon a=-2..x=190 as leftMargin; lat a=190..x=-2 as topMargin, i.e. latitude inverted on screen)
- Verified numerically against the decompiled tables: a=0/1.0, i=0.333/0.667, x=0.958/0.042 — matching within 3% (the reference table is slightly non-uniform)
Label stays at upper-middle (28sp bold); marker is only drawn when a valid locator exists.
mckero
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