Recently I purchased a new fluxgate compass (trademarked Williams F1 made in
China) very neat, and cheap (£9.99). It works fine and calibrates well, but
when the LCD blue glow backlight button is pressed, it lights-up for the
requisite 60 seconds or so, BUT the compass reading goes all over the
place - quite unusable! I guess that was why the compasses were selling so
cheaply in the store. Only for use in daylight!
The backlight is electrolumninescent and obviously is generating a spurious
magnetic field. Has anybody any experience or ideas on how this problem can
be overcome?
-Roy-
(Surrey, England)