Humminbird Side Imaging Forums

General => General Discussion => Topic started by: newkid4si on March 31, 2017, 11:02:11 PM

Title: GPS Altitude accuracy
Post by: newkid4si on March 31, 2017, 11:02:11 PM

One of the blocks of information in the "GPS Diagnostic View" is Altitude.  Any thoughts on its accuracy for monitoring water level fluctuations when recording on a reservoir at different times throughout the year?  Water level is not monitored and several launches are used.

           Mike 

Title: Re: GPS Altitude accuracy
Post by: rnvinc on April 01, 2017, 10:21:37 PM

Interesting Mike ... I've never even thought about it ...

I will make a note to check it with my lake's water level ...

Rickie.

Title: Re: GPS Altitude accuracy
Post by: tschultz on April 04, 2017, 08:02:24 AM

Of the three axis altitude has the highest degree of error. General consumer gps is not really accurate enough to account for water level changes, you'd need to step up to a survey type grade gps with rtk.

With a standard consumer gps your altitude error is in the range of plus minus 10-50 ft. Good for an idea but not really for water level corrections.

Title: Re: GPS Altitude accuracy
Post by: newkid4si on April 05, 2017, 11:36:20 PM

Thank you for taking the time to post this.  I was afraid that was to good to be true.  Now I have to go around the lake and mark seven different launches.

        Mike