Check the listing for details. ASA Overcasters - IFR Training Aid - View Limiting Device - ASA-OVC2. Condition: New. Listed at 19.99 USD. Overcasters® are a lightweight, simple, and effective view-limiting instrument training device for pilots. With a frosted, clip-on visor that attaches to a prescription eyeglass or sunglass frame in seconds, Overcasters eliminate the discomfort of straps, helmets, or hoods. When flipped down, Overcasters provide near perfect simulated instrument conditions, and when flipped up, the device serves to mimic “instrument-to-visual” transition.When not in use, Overcasters can remain attached to your glasses or be clipped onto a kneeboard, notebook, or flight bag for easy storage. Manufactured for flexibility and durability, Overcasters are widely accepted by FAA examiners for use in practical tests and checkrides. Made in Korea. Part Number ASA-OVC2