Daily Archives: February 19, 2014

Setting Up GNSS Internet Radio to Play NTRIP Corrections out the Serial Port

Setting Up GNSS Internet Radio

GNSS Internet Radio is a great tool for playing network corrections out of your PC’s serial port.

Put just the .exe file in a folder (bringing along other files that may be write protected will hand the tool):

Just the GNSS.exe file

Just the GNSS.exe file

Start the program:

GNSS Internet Radio

GNSS Internet Radio

Click on ‘Broadcaster’:

Enter Address, Port, User and Password

Enter Address, Port, User and Password

Enter your Host, Port, ID and Password, then click OK. It will take as long as 30 seconds to load a large source table (like PBO Realtime’s):

WAIT! It takes a while to download and sort the table.

WAIT! It takes a while to download and sort the table.

Click the ‘Settings’ button:

GNSS Internet Radio Settings

GNSS Internet Radio Settings

If you are going to pass incoming corrections out to a COM port for retransmission, select the ‘COM-Port’ radio button and click on ‘COM-Port Settings’:

Output COM Port Settings

Output COM Port Settings

If you are going to select a mount point, you need to check the ‘man. GGA’ box and set the GGA output location:

Spoofing a location for a Virtual Base

Spoofing a location for a Virtual Base

Enter the Latitude and Longitude in decimal degrees.

On the main menu, choose the correct ‘Stream’:

Choose the correct correction stream

Choose the correct correction stream

Finally, click on ‘Start’,

GNSS Internet Radio running...

GNSS Internet Radio running…

The blue bar will start to move across the screen.

Corrections will be played out the selected serial port.

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Used GPS Equipment. How much is it worth?

A reoccurring question that I am asked: “how much is my old equipment worth?” and “How much should I pay for old equipment?”

I have some thoughts…

Consider a ProMark 2 receiver with all accessories. If it were brand new in the box, would it be worth $1,500? (There are several on eBay right now.)

Consider that we are selling X90-OPUS dual frequency static bases for $1,620 brand new. In a case, with good batteries and cables and a 2-year warranty! So if you were to use the PM2 as a base or a static rover, I think the $1,500 answer is clearly — absolutely not. Would you pay $500 for a PM2? Again, I think not. It is worth $1,620 for dual frequency and access to OPUS, so even if you were to give away the PM2, I think it has no value. It is only as a Stop-N-Go rover that the PM2 would have any value. And then, not much

Next consider a ProMark 3, are they worth $1750 for a complete single receiver?

It is the same equation as the ProMark 3, except that the PM3 has additional problems: no IO Pods, no Batteries, no USB connection to 64-bit machines and slow SV tracking. In my book the PM3 only has value as a Stop-N-Go rover.

The other day I saw a ProMark 3 (used in fair condition) sell for $2,800 on eBay. For the record, we sold these receivers brand new, with 1-year warranties for $3,200 in 2006! Can they be possibly worth $2,800 today?

NO. They can not be worth $2,800. That one could sell for that is a mystery of eBay. Someone got very lucky and somebody else got…well…screwed.

Laptops (which are a similar device) have a lifetime of 2 to 4 years. After 4 years, they have little residual value, typically $100 at most.

The GNSS industry changes quickly. New constellations, new processing algorithms, longer life on batteries are a few of the enhancements that we see on a yearly basis.

So with that backdrop, what are reasonable  general expectations for GNSS equipment?

I personally think that professionals should plan on replacing equipment every 4-years.

I believe that the value of GNSS equipment decreases 50% per year. Consider a $12,000 rover:
New: $12,000
12-months: $6,000
24-months: $3,000
36-months: $1,500
48-months: $100

This means that you need to purchase equipment and use it. If you are only going to use a base/rover pair twice per year, you should rent. Even though it costs a fortune to rent.

Now, I know that many of my customers have extremely old equipment that they use everyday. I have two customers who are using GG-24 RTK receivers from the 2002 era! Several customers are running entire fleets of Z-Extremes and Z-Surveyors. I happen to know that these same companies always have the latest desktop computers, software and trucks.

Why do they not purchase new GNSS equipment that at least tracks GLONASS? I suppose their current equipment works good enough to get them by.

But, if you are looking to purchase used equipment, please consider these things:

  • New GNSS RTK pairs are 25% of the cost of  GPS RTK 10 years ago.
  • New devices can be easily fixed.
  • New devices have warranties.
  • New devices are supportable (your dealer can answer questions about them)
  • New devices will pay for them self’s quickly.
  • Financing (often same as cash) is available on new equipment.

If you are looking to sell used equipment, the best advice that I can give you is to sell it as quickly as possible. Every year that you wait reduces the value of your equipment by 50%!


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