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Boxed letters on the FMC / MCDU

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On the keypad of the FMC / MCDU of both on Boeing and Airbus aircraft, the letters E, N, S, W often have a box around them. Anyone know what that's about?

Sletvik, Thomas

20461.jpg

i7 6700K @ 4.6GHz, ASUS Z170-PRO GAMING, 32GB DDR4 2666MHz, 750W EVGA SuperNOVA, 512GB Samsung 960 PRO, 1TB Western Digital - Black Edition
RTX 2080Ti (MSI trio), Corsair H115i - 280mm Liquid CPU Cooler

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Ah, but when would I find it convenient...?

Sletvik, Thomas

Loooonggg time ago, there where no GPS in airliners, and you were supposed to enter coordinates in the FMC for IRS alignment.

Those boxed letters were really convenient. I guess they didn't made a new version of the hardware since.

Best regards,

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