A display has a panel (3) connected to a funnel (5). An electron gun assembly (13) positioned in a neck (4) at a narrow end of the funnel is provided for directing electron beams toward a screen (12) on the panel. The display includes a yoke (14) to scan the beams across the screen, a degauss coil positioned on the funnel for degaussing the display, and a DC canceller coil (72) for counteracting beam displacement caused by North/South magnetic fields. The display can include a means to dynamically correct beam landing errors, additional coils near the wide end of the funnel to further assist in correcting beam landing errors, and a magnetic field sensor (17) to sense ambient magnetic fields and generate signal to appropriate drivers to correct for beam landing errors.
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