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U.S. Skydivers today have a choice in the Automatic Activation Device (AAD) to have installed in their reserve container as a backup safety device. An AAD cuts the reserve container closing loop if the skydiver is exceeding a set speed at a set altitude. For most sport skydivers, the activation speed is the same (78 mph or greater), but activation altitudes vary from 750 to 840 feet.

Regardless of the unit, it's a "last chance"� deployment for a skydiver who has become incapacitated to deploy or has lost altitude awareness. For U.S. skydivers, there are three AADs that are the most user-friendly and commercially available. This article will focus on the Cypres/Cypres2, Vigil/Vigil II and Argus.

Each AAD manufacturer wants to prosper, and is doing everything within their means to put out a quality product that will only cut the reserve loop when needed. But keep in mind that all electronics can malfunction, and there have been technical issues and reports of misfires for all current AADs. Yet, this is uncommon.

Airtec, manufacturer of the Cypres and Cypres2 units, is today's industry standard for AADs. The Cypres units have been commercially available the longest of the three major sport skydiving AAD products. The original Cypres is no longer manufactured, but is still supported for maintenance, service and parts. The Cypres2 is the company's current product. One of the biggest selling points for the Cypres2 unit is the history of the company. Many skydivers feel the units are more reliable than others because they have been producing units for the longest period of time.

The current Cypres2 units have an anticipated lifetime of 12.5 years. The units are water resistant and have a jump counter. The Cypres2 battery is designed to last 4 years and is replaced during the 4-year and 8-year maintenance checks. For the required maintenance, the units must be shipped to SSK Industries in Ohio and are tested/updated for a minimum of two weeks for $160 plus shipping costs. The Cypres2 unit is available in different modes, but the modes (Speed, Expert, Student and Tandem) can not be changed by the user. Riggers can replace the Cypres2 cutter as well as the water filter on the units. Retail price is currently $1595. ChutingStar sells the Cypres2 unit for $1425 and you receive an $85 credit with an expired original Cypres trade-in.

Advanced Aerospace Designs manufacturers the Vigil AAD. The unit was the first "multi-mode"� unit commercially available to sport skydivers. The Vigil also has a menu screen with a variety of options, including the ability to download detailed jump information from the unit for the past 16 skydives with the Vigil IR download box (available separately) connected to a computer. The unit was met with some resistance in the industry due to being the new kid on the block as well as a management shakeup early on. The older units also had a plastic insert in the cutter that was susceptible to damage from container grommets (a stainless steel cutter without an insert is now manufactured with the current Vigil). The company has released an updated Vigil II unit.

The Vigil unit has a lifetime of 20 years. The multi-mode unit can be switched from Pro to Student to Tandem by the user. The Vigil battery is designed to last 10 years or 1500 jumps. The Vigil II battery is good for at least 5 years or 2000 jumps. The manufacturer requires the battery to be replaced every 10 years, but recommends replacement of the battery every 5 years. There is no required maintenance on the Vigil or Vigil II unit unless an error code is displayed during the startup. The control unit, cutter and battery are all field-replaceable. The original Vigil unit is not waterproof, but the Vigil II unit is waterproof. Retail price is $1320. ChutingStar currently sells the Vigil for $1290.

Aviacom manufacturers the newest AAD that has gone into production for sport skydivers: the Argus. The Argus is the first to have a swoop mode that inactivates the cutter after the initial canopy deployment. It is also the first unit to have an "over-the-counter"� lithium battery as its power source. The Argus is a multi-mode AAD, which allows the user to switch the unit from Swoop to Standard to Student to Tandem. The Argus is the smallest and most compact unit available. The unit had a plastic insert in its cutter for its first 200 units that were susceptible to damage from container grommets. The company replaced all those cutters free of charge and all new Argus units come with a stainless steel cutter.

The Argus has an unlimited lifetime (as long as it passes each 4-year functional test). The battery must be replaced once a year. A one-day functional test of the unit is required at 4 and 8 years from the date of manufacturer ($100) and can be sent to several different service centers throughout the U.S. (including ChutingStar). The unit has a menu screen with a variety of options. The unit is water resistant. The control unit, cutter, battery and water filter are field-replaceable by riggers. Users can access their jump numbers, freefall time and freefall speed on the Argus. Retail price is currently $1244 for the Argus unit. ChutingStar currently sells the Argus for $1099.

I get asked a lot about which AAD I recommend. I own one Cypres2, one Vigil and one Argus. I also own one rig without an AAD. I feel comfortable using any of the AADs, and at times, none at all. So, in the end, it's up to you. I don't think you can go wrong with any of the units. It's all up to what history, features and price you are most comfortable and happy with.