I've been using dump1090 to pick up local Hilo (ITO) air traffic using a cheap USB software-controlled radio dongle. Basically dump1090 decodes ADS-B broadcasts that aircraft send out.
Here's a sample of what Hilo air traffic looks like:
Hex Flight Altitude Speed Lat Lon Track Messages Seen .
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ac9ca4 0 0 0.000 0.000 0 140 875 sec
a17371 0 0 0.000 0.000 0 305 192 sec
aafd2b 0 0 0.000 0.000 0 113 2916 sec
a02b4b 4525 0 0.000 0.000 0 734 418 sec
a5f825 13500 0 0.000 0.000 0 723 293 sec
a79130 0 0 0.000 0.000 0 533 1636 sec
a02b4f 0 0 0.000 0.000 0 410 1851 sec
adb2b3 25 0 0.000 0.000 0 557 295 sec
a1824d 0 0 0.000 0.000 0 419 420 sec
aa3f28 -100 0 0.000 0.000 0 317 0 sec
a5e949 1525 0 0.000 0.000 0 25 0 sec
a5df82 0 0 0.000 0.000 0 364 1165 sec
aa341c 0 0 0.000 0.000 0 1 532 sec
ab8752 0 0 0.000 0.000 0 103 4495 sec
a7901c 0 0 0.000 0.000 0 370 6448 sec
7c4836 0 545 0.000 0.000 50 1 21807 sec
a91d39 0 442 0.000 0.000 58 2 22865 sec
ac90b0 17900 0 0.000 0.000 0 3 23607 sec
ab4730 14350 0 0.000 0.000 0 224 23683 sec
a3c847 -125 0 0.000 0.000 0 846 18545 sec
a4b5a7 0 0 0.000 0.000 0 177 310 sec
a17728 0 0 0.000 0.000 0 177 105 sec
a5f46e 0 0 0.000 0.000 0 748 4 sec
a2d1b2 0 0 0.000 0.000 0 201 2760 sec
a61836 717 10750 0 0.000 0.000 0 2523 5299 sec
a61bed 717 10250 0 0.000 0.000 0 1509 8413 sec
a5ff93 11000 0 0.000 0.000 0 686 3908 sec
ac9b28 0 0 0.000 0.000 0 149 8414 sec
a7046f 0 0 0.000 0.000 0 2870 23 sec
a60701 10225 0 0.000 0.000 0 657 10346 sec
a6147f 717 9950 0 0.000 0.000 0 1130 12495 sec
If you lookup the ICAO hex identifiers, you'll see that a good chunk of them are tour helicopters (for example: a17728)
It appears that currently dump1090 is misinterpreting some of the ADS-B data that the aircraft are broadcast. For example, ICAO hex a6147f is a Boeing 717 operated by Hawaiian Airlines; however, dump1090 lists "717" in the "Flight" field.
We'll keep playing with this.
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