Marahall gps system issue

[jaredharris]

Try it like 50ft or 100ft apart. My experience with my sponsor's setup is it basically doesn't work under 25ft or so; it'll do stupid things like tell you your tx is 60ft on your left when it's on your bird on your fist. Distance between the iPad / pocket link and the tx seems to fix that problem; the only time I've seen it wrong at distance is when the bird hit a fence and tore the tx off its leg (no significant injuries), and then it wasn't so much wrong as much as my sponsor just didn't look up to see the bird wasn't where the iPad said it was.

Also, you're the guy I talked to about the test in Lubbock, right?

This solved it just a little to close but solves the problem when farther away.

Yes sir! Glad to say I passed

[rkumetz]

This solved it just a little to close but solves the problem when farther away.

Yes sir! Glad to say I passed

Jared,
Keep in mind that the GPS doesn't get a position like "you are here at x y"
from the satellites. It uses the signal from a number of satellites to mathematically determine where it is on earth with respect to those satellites in orbit. If you have 2 receivers very close the error between the calculations done by the two receivers can be large enough that they appear to do unpredictable things relative to each other even though the actual error in absolute location is pretty good.

[jaredharris]

Jared,
Keep in mind that the GPS doesn't get a position like "you are here at x y"
from the satellites. It uses the signal from a number of satellites to mathematically determine where it is on earth with respect to those satellites in orbit. If you have 2 receivers very close the error between the calculations done by the two receivers can be large enough that they appear to do unpredictable things relative to each other even though the actual error in absolute location is pretty good.

Thank you for this! I understand how this thing actually works now. Makes complete sense when you explain it.... Im not really sure how I thought it worked but I was off. Needless to say we went hunting today and it performed great! Really a cool little tool

[Captain Gizmo]

In the basic form GPS is a +- 30 Meter accuracy system. If you are set up for WAAS (Wide Area Augmentation Service) you get down to the +-3 meter accuracy needed for a legal instrument aircraft approach. For the inch type accuracies needed for survey work you need a local augmentation system, usually a base station set up at the local section corner marker with a data link to the survey set, and then let it grind out an average for a while.

I would be surprised if Marshall comes up with a way to add WAAS to the transmitter (the Pocket Link maybe). I worked in this field. As it is I am very impressed by a GPS receiver, a data link transmitter, a command link receiver, and a beacon transmitter all crammed into 8.5 grams.