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What can your GPS really do?

Whether handheld or panel-mounted, a global positioning system (GPS) receiver can be one of the most useful tools you will ever purchase in aviation. But while its potential uses may be unlimited, understanding what not to do with your GPS may be just as important as what you can do.

GPS units can be divided into two major categories — handheld and panel-mount. Handheld units are very capable and often can be plugged into a power source to negate the issue of battery life — until a back-up is required. Currently, there is a wide variety of units available on the market. Some have the ability to simply go from point A to point B, while others can match the capability of the panel-mount units with color screens, weather, traffic, and terrain depictions.

But no matter how good the displays or how capable the units, the FAA currently does not allow them to be used for IFR. Because handheld GPS units have the potential to lose power under battery, and lose signals because the antenna isn't hard-wired, the FAA feels they are potentially less reliable than their panel-mount counterparts. They are to be used for situational awareness and VFR navigation only. Unfortunately, that means you cannot file IFR "/G" (as a GPS-equipped aircraft) with a handheld.

On the other hand, panel-mount units can be used for IFR if certain conditions are met. First, the unit must meet the FAA's IFR certification standards. This also goes for the installation of each particular unit. Finally, the database must be updated to reflect the most current data. Updates are usually accomplished via a data card or port. If a unit does not meet that criteria, you can only use it for VFR.

Your unit must be IFR certified for en route and terminal navigation to be able to file "/G" in an IFR flight plan. Doing so opens the possibility for using your GPS on new direct routes through terminal airspace, called T routes, as well as for flying GPS approaches. There are even new GPS SID (standard instrument departure) routes and STARs (standard terminal arrival routes). You can find more about this subject on AOPA Online ( www.aopa.org/whatsnew/newsitems/2005/050901rnav.html). Also, you can use your IFR-certified GPS in lieu of DME (distance measuring equipment) and ADF (automatic direction finder). Visit the Web site ( www.aopa.org/whatsnew/newsitems/1999/991213gps.html).

GPS allows us to navigate more effectively than all previous methods combined. The professionals in the AOPA Pilot Information Center can answer all your GPS questions. You can reach them at 800/USA-AOPA (872-2672) Monday through Friday from 8:30 a.m. to 6 p.m. Eastern time.

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Answers to frequently asked questions about your AOPA membership

Q: I'd like to give an AOPA membership as a gift to a friend. Can I do that?

A: Giving a friend or relative a membership in AOPA provides them with information and tools that help them fly safely and get more enjoyment out of flying. Your gift recipient will receive a special gift card announcing your gift and the AOPA pilot's cap. Use our convenient online form ( https://www.aopa.org/giftJoin/gift.cfm) or call member services to help someone celebrate the holidays or any special event.

Q: I'm having trouble logging in to the members-only section of AOPA Online. What should I do?

A: If your username/password combination isn't working and you have an e-mail address on file with us, just use the Forgot Password link on the login page to have a new password e-mailed to you. We've also recently added an online login assistant that can walk you through some common troubleshooting steps. Still having trouble? Just call member services and they'll be glad to help.

Q: I'd like to make a charitable donation that I could use as a tax deduction for 2005 that would benefit general aviation. Any recommendations?

A: Yes! The AOPA Air Safety Foundation (ASF) is an educational charity serving pilots. Your gifts, large and small, to ASF are tax deductible. Donation options and programs can be found online ( www.aopa.org/asf/development/) or you can call member services to learn more about how your gifts help the Air Safety Foundation make GA flying more safe and secure for everyone.

Member Services contact information:

Phone: 800/USA-AOPA (872-2672), 8:30 a.m. to 6 p.m. Eastern Time Monday through Friday
After hours: Renew your membership, reset your Web password, or enroll in Automatic Annual Renewal using our self-service touch-tone phone option.

E-mail: [email protected]

Web: Update your personal information, renew your membership, and much more by clicking on My AOPA in the left column of our home page.

Ian J. Twombly
Ian J. Twombly
Ian J. Twombly is senior content producer for AOPA Media.

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