My old D72A does all that I want it to including interfacing with an old handheld Garmin 60Cs and 60CsX mapping GPSs through a single cable. I was tracking rockets on a map over 10 years ago. First using a laptop with outboard TNC, radio and then with the D72A when it came out. I had two used D7Ag's where the frequency encoders became out of spec and I couldn't tune frequencies correctly. Repair shop fellow said they could be fixed but the 72A came out and I abandoned that.
It became really addictive as in APRS mode the D72A (and I'm sure later versions of KW's handheld APRS rigs do too) I could isolate the altimeter readout and read that as the rocket was descending in real time. The position would be plotted on the handheld mapping GPS. I could follow the descent and put my eyes in the right place when the main chute blew. I'd just walk toward the last known position with a handheld Yagi to increase the ground footprint and I never lost a rocket with this method. 900Mhz Yagis are good for EggFinder stuff for recovery. I'd take the omni antenna off the receiver after the rocket was "down" and plug in the Yagi. It's easy to aim a Yagi at a 900Mhz tracker while the rocket is stationary on the ground. Ham band stuff, one can keep a Yagi pointed in the right direction with the ability for increased range reception.
GPS tracking either by the 900Mhz non-licensed NMEA trackers or the APRS Ham band trackers is essential for rockets that are flying out of sight for long periods of time. Upper air winds can wreck havoc on a rockets final position. The longer the rocket is out of sight, the more chance visual contact will never be achieved on descent. If the rocket lands out of sight then that last known position packet is crucial for an easier recovery.
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