Garmin Tips and Tricks #19
Holds on the GTN 750
Keith Thomassen, PhD, CFII
The latest software (6.11) for the GTN 6XX/7XX has a number of significant additions, such as showing previous flight legs on the map, adding fixes on an approach that are not shown when you choose VTF as the transition, and the ability to load a secondary approach while flying the missed of the current approach. It also enables RF legs, which are usually found on RNP approaches but can occur on RNAV (GPS) approaches. Perhaps this means the FAA is now relenting and plan to allow GA pilots to fly them (they have denied the privilege for some time). The Radius to Fix (RF) leg is an arc that you enter and exit on a tangent, and may have a smaller radius than is used on DME arcs (AF leg).
One of the new additions is the ability to make a hold at any waypoint. This feature has long been included in Chelton and Garmin GNS 480 devices, but is new to the GTN 750. The hold is a HM leg (hold to a manual termination) and on entering the leg, sequencing is suspended. When you’re ready to depart the hold, just touch the UNSUSP tile.
Here is an example on a flight from Burley ID (KBYI) to Salt Lake City (KSLC) along V101 to TCH, direct. The flight plan is shown in Figure 1, and on the way to the Ogden VOR we’re asked to hold there, inbound on the airway leg (124° CRS). Make right turns, with 1 min legs.
Figure 1. Flight Plan to KSLC, and the OGD leg identified in that Plan.
There are several ways to initiate this addition, one being to select the leg to OGD in the flight plan, by putting a cursor (touch the OGD tile) on that leg (see right picture in Figure 1). Now, push the D-> button on the bezel and the “Direct To” dialog box of Figure 2 appears. To create the hold, touch the Hold box (left screen in Figure 2).
That brings up the Hold dialog tiles in the right screen. Notice that by default the Hold is on the course to OGD, with standard 1 min right turns. Any of these can be changed. You can hold inbound or outbound, the leg type is time or distance, and turns are right or left. You can choose the time or distance in the Leg Length box.
Figure 2. Flight plan with a cursor on OGD left, and hold dialog on right.
Next, push the tile “Load Hold” to load it into the flight plan (see Figure 3). When you’re ready to go Direct OGD and hold, push the “D-> Hold Activate” tile. On the flight plan list there is then a small magenta arrow on OGD in the right screen. This indicates you are now, Direct OGD.
You can also get the “Direct To” dialog box by pushing the D-> button on the bezel first, before identifying the waypoint. Then the waypoint you want can be put into this box. If you are on the leg to OGD that waypoint appears by default.
Figure 3. Flight plan with Hold at OGD loaded (left) and Activated (right).
Incidentally, notice in Figure 2 (left) that you can use this dialog box to make an OBS course to OGD (or any other waypoint you enter into this box). Just touch the “Course To” tile and change the course on the keyboard that appears. Then touch the “D-> Activate” tile to create the course, and the leg will sequence at OGD. You can always make an OBS course to the waypoint ending your active leg; just push the OBS tile and enter a course. In that case, unlike using the D-> box, sequencing is suspended and you need to restore it manually. When you do, the course remains on the new course so you can push UNSUSP just after shifting the active leg to the new course.
Figure 4. Approaching the hold (left), with the “Hold Direct” entry flashing, and just entering
the hold (right) with the SUSP light on.
Figure 4 shows the flight plan when approaching the hold. The type of entry will be shown in flashing white on the bottom, and whatever the entry is, it can be flown with an autopilot in the GPSS mode to accept the roll commands from this entry and hold. In the screen on the right, the hold is a dotted magenta line indicating the HM leg is active, and the SUSP light is on.