Daily Archives: October 28, 2013

Large SD Cards on Z-Max Receivers

Last week I encountered a ZMax receiver that took forever to read the SD Card. And after it completed registering the card (about 10 minutes), the ZMax just rebooted. I watched it happen.

I pulled the SD Card and stuck it in my laptop to check out the Micro_Z.bin.

Of course the file was 512 megabytes in size.

This won’t work! There is not enough internal memory in a ZMax to mount a Micro_Z file larger than 128 meg and I STRONGLY recommend that you use a 24-Meg file.

If you find yourself in the position, you can quickly fix it by

1. Download this ZIP file: http://www.ashgps.com/bin/MICRO_Z.zip

2. Unzip the contents to a ‘MICRO_Z.bin’ file.

3. Format the SD card.

4. Just copy the extracted ‘MICRO_Z.bin’ file to the SD card.

The smaller bin file will mount very quickly.

My theory is when the file is damaged, the ZMax builds a new one that completely fills the available SD card. And 512 Meg is just way too big.

BTW, I don’t think that the ZMax can read SD cards larger than 2 gig.

M

 

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NAD27 UTM in “FAST Survey” and “SurvCE”

SurvCE (and FAST Survey) don’t have NAD27 UTM projections built-in. So if you are working with an older dataset (like Oil and Gas) you are going to need to enter a new projection manually.

Here is how to set up for NAD27 Zone 12:

Make a new job, be sure to select ‘Meters’ (unless you want US Survey Feet or International Feet.)

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Click on ‘Edit Projection List

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Press the ‘Add User Defined’ button.

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Configure to match as above. (You will need to adjust the C. Meridian to match your UTM Zone.) Then click the ‘New Datum’ button.

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Configure to match as above.

Click the ‘Green Check Mark’ four times to return to the main menu.

Let’s check our new projection:

Now click on ‘COGO, Calculator, Conversion and put the dot in LLH->Grid’

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Enter the lat and lon as shown above. If you entered everything correctly, then the computed Northing and Easting will be as shown.

You are now ‘Good To Go!’

M

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