Springtime is in full swing as the fragrance of blossoming flowers fills the air, newborn bunnies gather in the backyard to nibble on clover, and pilots flock to the Garmin website for… software updates?
The GTN 750 and GTN 650 were announced and available for shipping March 23 when Garmin unveiled them at the Aircraft Electronics Association (AEA) Convention. Also announced at that time were the GTN 635, GTN 625, and GTN 725. As of July 1st these GTN models are now available for purchase and shipping. So what is the difference between the different GTN models? Basically, the GTN 625 and GTN 725 are GPS only, while the GTN 635 is a GPS/COM. The GTN 650 and GTN 750 are GPS/NAV/COM. For a more detailed list of the differences I’ve included a comparison chart from the GTN mini-site. The GTN 625 is priced at $9,595, the GTN 635 at $10,495, and the GTN 725 at $15,000. Now the full line of GTN models are available in a price range for your budget, so to start your panel upgrade visit a Garmin Aviation Dealer near you.
Engadget passes on a Federal Aviation Administration advisory (PDF) that, due to Defense Department testing, GPS signals may be “unreliable or unavailable” within several hundred miles of a point off the coast of Florida and Georgia for brief periods between January 20 and February 22, 2011. The advisory is aimed at pilots, but we can surmise that terrestrial GPS usage — admittedly less a matter of life or death than aviation — might be affected as well. The radius affected increases with altitude: 370 nautical miles (685 km) at 40,000 feet (FL400, 12,200 m), falling to 215 nautical miles (398 km) at 4,000 feet (1,220 m).