Keyboard

Press –

  • Alpha keys: Data displays are controlled by the keyboard when the N, S, E, W (latitude / longitude) or H (heading) keys are pressed

Pressing an alpha key arms the keyboard for numeric entries.

  • Numeric keys: Permit manual entry of present position when ALIGN Light is illuminated

Permit manual entry of magnetic heading when either mode selector is in ATT.

Enter (ENT) Key

Illuminated (white) – N, S, E, W, or H entries are being keyed.

Press – Keyed data is entered into IRS following completion of valid self-test for reasonableness.

Clear (CLR) Key

Illuminated (white) – An ENT attempt has failed (entry not accepted by IRS).

Press – Clears data display of any data not yet entered or accepted. If illuminated, cue lights extinguish.

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