Non-Slaved HSI. The non-slaved NSD360A unit defines cost-effective HSI performance by utilizing air-driven gyro technology. Easy to read display combines the functions of the directional gyro and VOR/ILS indicator into one panel space-saving unit.

Slaved HSI. This unit offers the best features available in an HSI, matched with the proven simplicity of air gyro operation. Automatically updates compass card to correct for precession.