Author Topic: Spatial accuracy of GPS on 797 unit  (Read 2455 times)

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Offline USFDave

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  • Location: University of South Florida
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Spatial accuracy of GPS on 797 unit
« on: April 27, 2011, 03:49:11 PM »
Hello all, new to the forum, but been reading for a while.

I have a question regarding the spatial accuracy of the GPS in the unit. It seems to be off a bit (I dont recall driving over the corner of an island).

A bit of background, I am using the side scan in shallow (1-5ft) salt water here in tampa Bay to image propeller scars in seagrass beds. I am using both Humviewer and Dr.Depth to review and export my recorded data and conducting data analysis and mapping in ESRI ArcGIS.


Offline USFDave

  • Newbie
  • *
  • Joined: Apr 2011
  • Location: University of South Florida
  • Posts: 2
  • Unit(s): 797c si
Re: Spatial accuracy of GPS on 797 unit
« Reply #1 on: April 27, 2011, 04:47:54 PM »
here is an example

Offline Roddy

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  • Location: Mount Pleasant,Charleston Co,SC. USA
  • Posts: 607
  • Scan,scan and rescan
  • Unit(s): 797c2, 947c,987SI/DI,570di,1198,1155,Ip
  • Accessories: wx/Tow Fish,Drop Cam's,ROV''s
Re: Spatial accuracy of GPS on 797 unit
« Reply #2 on: April 28, 2011, 11:20:08 PM »
FSUDave; Reenter in ArcGIS, ck for GPS offset, if found reset to "0".

Let us know what you find. Good luck and enjoy.  Roddy
Scan,Scan and Rescan Roddy

Offline xSilmarilSx

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Re: Spatial accuracy of GPS on 797 unit
« Reply #3 on: April 29, 2011, 03:15:17 AM »
Check to be sure that the unit is Set to WGS84.

I had accuracy problems if set to other format


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