GeauxGeo

I am using a Garmin 276C GPS.

Question 1: would you classify a Garmin 276C GPS as a recreational or mapping grade GPS?

Question 2: Can you post-process positional data from the Garmin 276C? That is, can you send positional information from the Garmin 276C to the NGS website OPUS? I'm pretty sure that you can't but I have spoken to others that suggest that you can.

Any response would be greatly appreciated.

gpsnetwerx

it is rec grade all day long. unless you can trap the data and find a way to convert the garmin binary to a rinex, i doubt you can get an opus solution.

what do you want to do with the 276?

GeauxGeo

Thanks for the reply gpsnetwerx. I have been using the 276 to re-visit some locations that I have been 'monitoring' for some research that I am working on for my graduate research. Its a great hand-held rec GPS, but it isnt' as accurate as I'd like it to be. Cost is a major limitation, so that is why I have been using a rec. grade GPS.

A second limitation is the accuracy. Although I can get pretty close to the original position (2-3 m) I cannot increase the horiz. accuracy to the level that I'd like (< 1m). I am familiar with the rinex format and with OPUS, but I have yet to discover a way to post-process the 276 data with OPUS or other methods. Regardless, I'm confident that I am unable to convert 276 data to a rinex format, but I just wanted to make sure and see if I was overlooking some post-processing method that I had yet to think of.

Thanks you for your reply.

gpsnetwerx

what research are you involved? academic? there may be a way to get you a "loaner" shoot me a pm

astrodanco

OPUS will refuse to process L1 only data. It insists on L1+L2. Try RTKLIB.

crichard75

Hi. A further question to this thread, from a novice with GPS' and GPS data manipulation. Would data denerated on a Garmin 60CX be good enough for post processing? From the rest of the thread I suspect not. I'm looking at the feasibility of comparing my GPS data to a local Active GPS Station RINEX data in Ireland, for better accuracy. If it is, which would be the best programe to use? RTKLIB?
Thanks

astrodanco

The 60CX would need to be able to output raw pseudorange, carrier phase, etc data. You'd then also need a program to convert that output to RINEX format. I'm using a u-blox EVK-6T GPS receiver (which has a u-blox LEA-6T chip inside it). The LEA-6T outputs the required raw data. RTKLIB has a converter that supports converting u-blox raw format to RINEX. That's why it works for me.