Housed inside a rugged diecast aluminum, the LC90 has a splashproof membrane keypad to control all operation. Both the keypad and LCD display have variable backlight for convenient nighttime operation.
Once local Lattitude and Longitude have been entered, operation is completely 'Hands Off.' The LC90 will automatically select the master and secondaries, compensate for ASF and magnetic variation, and set all 6 notch filters to eliminate interference. If desired, however, all automatic functions may be manually overridden by the operator.