Humminbird Side Imaging Forums

Side Imaging Forums => 797c SI => Topic started by: USFDave on April 27, 2011, 03:49:11 PM

Title: Spatial accuracy of GPS on 797 unit
Post by: USFDave 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.

Title: Re: Spatial accuracy of GPS on 797 unit
Post by: USFDave on April 27, 2011, 04:47:54 PM

here is an example

Title: Re: Spatial accuracy of GPS on 797 unit
Post by: Roddy 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

Title: Re: Spatial accuracy of GPS on 797 unit
Post by: xSilmarilSx 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