According to the maker that compass has "tool-less declination compensation" - so you should be able to correct that for local magnetic declination
The video on their webpage shows how to make the adjustment - it looks like you apply pressure to the top and twist.
For comparison, my old Suunto has a small brass-coloured screw on the back that you adjust using a tool attached to the neck-cord
Adjustment screw is near the bottom of the black ring in second photo.
Heading vs Declination settings
- Fixed Luminous green/yellow lines on baseplate offset from "N" by declination.
- Floating Red pointer indicates magnetic-north
- 0 degrees
- N indicates grid-north (map north)
- Compass aligned with map grid lines
- Ignore this (inclinometer)
Compass ring rotated and set for travel to E
Compass body aligned with direction of travel, compass points E.
Compass pointer is inside the luminous markings, NOT aligned to N.
A huge magnetic anomaly suddenly appeared near Eskdale changing local magnetic deviation to 40°. (Massive subterranean upwelling of neodymium).
I therefore adjusted my compass' declination to match,
using the small screw on the underside (NOT the ring on the top).
My compass is still set to point East.
My compass needle still sits inside the luminous markings.
The luminous markings are now offset from grid-north by 40°