As of the end of 2021, I don't know of any country where Automatic Dependent Surveillance-Broadcast In (ADS-B In) is required. But I can also tell you that ADS-B In greatly enhances safety and if you can have it installed, it is worth it.
— James Albright
It is quite often called Cockpit Display of Traffic Information (CDTI) and symbology can mirror TCAS. But ADS-B In is so much more capable than TCAS. While the displayed position of a TCAS target is approximate, the ADS-B In target is precise. Plus you can get the Flight ID, differential speed, and a graphical trend vector.
I've flown a number of aircraft with ADS-B In but the one I am most familiar with is the Gulfstream GVII where it is known as the Cockpit Display of Traffic Information (CDTI). It is always available in the map displays but it defaults to a decluttered view. If you want the Flight ID, a trend vector, and to have surface traffic diplayed, you have to ask for it as shown here.
A. Flight ID
When the FLIGHT ID button is selected, the traffic targets with available flight IDs (from the traffic collision avoidance system (TCAS) computer) are displayed next to the traffic symbol of the corresponding traffic target when the lateral Map half-range is at or below 50 NM.
NOTES: 1. Flight IDs on non-automatic dependent surveillance-broadcast (ADS-B) traffic intruders are not displayed.
2. Due to cluttering, some flight IDs are not displayed.
3. This function does not affect the display of the flight ID for aircraft selected as the target for visual separation on approach (VSA) operations.
When the traffic intruder is highlighted or selected, the flight ID is displayed regardless of whether or not the FLIGHT ID button is selected.
B. Trend Vector
When the TREND VECTOR button is selected, a predictive trend line is shown with the traffic symbols that have a heading and track information from the TCAS computer. The trend line represents 30 seconds of prediction along the reported track for the traffic target when the lateral Map half-range is at or below 50 NM.
When the traffic intruder is highlighted or selected, the trend vector is displayed regardless of whether or not the TREND VECTOR button is selected.
C. Surface Traffic
When the 2D airport moving map (AMM) is displayed on the Map, and the SURF TRAFFIC button is selected, traffic targets on the ground are displayed.
Source: Honeywell Gulfstream Symmetry Flight Deck for the G500 Aircraft Pilot's Guide, §2B-09-10, ¶1.
ADS-B In isn't required so it is rarely "standard equipment" for new aircraft. For our aircraft, back in 2019, it was only available as an option packaged with other situational awareness items and it wasn't cheap. (Over $200,000)
You can, however, buy a portable ADS-B In unit that will provide the Cockpit Display of Traffic Information (CDTI). We have such a unit that we use when flying oceanic, shown here:
There are several portable units available. We chose the Garmin GDL 52 Portable Sirius XM / ADS-B Receiver, available a Amazon for $1,149.
We've added this to our cockpit for oceanic flights to have a back up in case of a highly unlikely loss of aircraft GPS and attitude information. The GDL 52 also provides a back up attitude indicator. If things really go badly when crossing the pond, the unit can get you to an airport and even keep you right-side-up until you can see the ground. I think, theoretically, you could shoot an instrument approach on it. (But I wouldn't recommend it.)
Gulfstream Symmetry Flight Deck for the G500 Aircraft, Pilot's Guide, Hoenywell International Inc., April 10/19.
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