Yeah, I've known that for years. When the rocket is 50 feet or higher in the air, one gets the last known position and the rocket is there. Might be a lower altitude if the rocket is closer to the radio receiver. I fly off of a corn stubble Midwestern field so wind is not an issue. Small light models may get blown by prevailing winds but if one gets to the last known position will likely be within the ground footprint to get a "new" updated position. I've never had that happen though as the corn stubble in the no till field usually stops a blowing rocket as the recovery harness or chute gets tangled in the stubble.
Usually the scenario is the signal is lost when the rocket is down. When going out to recover at the last known position, one gets an updated data stream of the final rocket position. Piece o' cake.
Technically, if the GPS receive antenna is facing the dirt when the rocket is down, might not get an updated position but one is usually close enough to visually find it. That never happened to me though. Always got good position fixes on the ground when I was in the ground footprint of the tracker.
Thing is if one has a Ham Radio callsign and use the 70cm/400Mhz and (Beeline and others) APRS trackers, use a 70 cm band Yagi antenna on your receiver. Will extend the range of reliable packet reception. Just swing the Yagi to where you think the rocket is and maximize the signal strength.
One memorable flight was a rocket that wasn't even mine but the flier was a Ham and was using a Beeline GPS tracker and Kenwood D72A. Motor was an L or M and the MD rocket ripped off up to the ether. Over 20k feet.
Well, I had my D72A interfaced to a computer and could see on a map where the rocket was going. Everyone was looking to the West and the winds aloft were pushing the rocket to the East. I could tell the rocket was under drogue by the descent rate as it was passing overhead still out of sight by my live mapping program. The D72A and most computer tracking programs will give the GPS altitude so descent altitude can be called out. Is cool because one can yell out when the main chute should be deployed knowing the settings of the deployment altimeter. Well this rocket was blowing towards the East when everyone was looking to the West as an East to West wind was blowing on the ground. I looked up seeing the crowd and started yelling, "Dammit, look East, look East, (pointing) it's overthere!!! We didn't see the main chute as the rocket was too far out of sight but I could tell by the APRS altitude reporting, the descent rate was nominal and the main chute had to be out. Got a good mapping fix and knew right where to go. The flier/owner of the rocket was struggling to get the last known position Lat/Long into his handheld GPS from his D72A. I told him to screw it as I know exactly where it's at and showed him on my computer map. Needless to say, he got his rocket back! I did tell him how to get the lat/long units right and input them into his handheld GPS. His mapping GPS was compatible with his Kenwood D72A and I told him what cable to get to interface them so he could have a map in hand with his Garmin 60Cs(x) to track his rocket live next time. He was very grateful and I was very happy I was able to help a fellow flier recover their high flying rocket.