As your flight transitions from en route to approach phase, the GPS provides a smooth CDI scaling transition from 5.0 nm to 1.0 nm sensitivity. When the aircraft is within two nautical miles inbound to the FAF, CDI scaling will again change from 1.0 nm to 0.3 nm. When an approach has more than one initial approach fix, the Approach Select Page will display the waypoint identifier for each IAF and allow you to select the desired one. Then, the unit will automatically sequence the remaining fixes for that procedure.
The first IFR-certified GPS that won't leave you up in the air.
Until recently, flying IFR with GPS could only take you so far. Because, until recently, no GPS could meet the FAA's demanding certification requirements for IFR approval.
No GPS, that is, until Garmin introduced the GPS 155/165 TSO: The world's first GPS receivers to be fully certified to FAA TSP-C129, Class A1 standards for non-precision approach use.
Now, these high performance systems let you fly IFR from takeoff to touchdown - with more than 4,500 GPS overlays currently available, including some 50 GPS-only approaches-with GPS as your primary navigation reference. And those numbers are growing every day.
Moreover, by choosing Garmin as your GPS source, you get the inherent reliability, workload-limiting features, ease of use, worldwide service and overriding peace of mind that can only com from flying the #1 name in general aviation GPS.
The Garmin GPS 155 and 165 units are virtually identical in IFR capabilities, features, and operating characteristics. But the differences go beyond the obvious shape and size. What you fly will determine which Garmin GPS is right for you.
The GPS 155 TSO is a standard 6.25 inch, Mark-width box designed for easy rack-mounting in the avionics stacks of most light aircraft, while the GPS 165 TSO is a 5.75 inch, ATR-width box with Dzus-rail mounts for installation in the consoles or control panels of most helicopters, business jets, truboprops and transport category turbine aircraft.
Both feature Garmins brilliant, three-line vacuum-fluorescent dot matrix display, which provides exceptional clarity and readability from almost any angle-even in direct sunlight.
Its huge Jeppesen database lets you access a range of navigation, communication, airport, airspace, approach, departure and arrival route information. Sectorized, altitude-sensitive SUA data is also included, made even more useful by a handy feature that turns off messages once you load an approach. Updates, available by subscription or individually, are easy to perform via a convenient mini-NavData card that slips into the front of the unit.
What's more, like any serious IFR navigation package, the GPS 155/165 TSO can fully interface with your flight control, EFIS, HSI, Moving Map, altitude encoder, fuel management, or other sophisticated systems. And in the event of an unexpected electrical shutdown, a back-up battery is automatically activated to keep the GPS going so you can call up the nine nearest airports, which the GPS is continuously tracking and updating for you.
Points of Interest
Databasics
Pre-loaded with all the flight information you need, the Jeppesen database lists airports, intersections, VORs, NDBs, minimum safe altitudes (MSAs), FSS frequencies, special-use airspace with sectorized frequencies, waypoint sequences for approved non-precision GPS overlay instrument approaches, SIDs, STARs, and more. Yet, Garmin's leading-edge technology puts this massive database onto the smallest, most convenient front-loading data card ever designed.
Navigation Aids
Active memory lets you store up to 1,000 user waypoints and 20 reversible flight plans of up to 31 waypoints each. (And you can add your won comments on up to 250 data items.) The aptly named Direct-To button sets an instantaneous course to any waypoint you've selected. An AutoStore function lets you input positions to build routes as you go. And Spell 'N Find feature allows you to search the database for an airport by city or facility name when you are unsure or the identifier.
RAIM Checks
Receiver Autonomous Integrity Monitoring (RAIM), critical to IFR approach certification, confirms satellite signal reception and warns of loss or degradation in the geometry required for accurate positioning. Incorporating RAIM, the GPS 155 and 165 provide constant reassurance that your approach information is accurate.
Approach Sequencing
Another qualification for approach certification, the GPS 155/165 TSO stores all navigation fixes for each authorized approach under its identifier listing. Thus, all fixes - including initial, intermediate, final, missed approach point, and missed approach holding fixes - come up in sequence, minimizing the chance you might call up and fly to the wrong fix, or enter the wrong frequency, when things get busy on the approach.
