Does Eco recieve GNSS signal before starting a measurement?

Follow

Yusaku Kokubu

• February 04, 2022 08:53

Hi:

I have set my Eco to start measuring from a future time. To obtain a correct GNSS location of the place where I am going to deploy, should I wait and make the first data collection while the Eco is still in air at the deployment site? Or, does Eco receive and update GNSS location data before the data collection starts?

0

• Official comment

  

  David Velasco

  • February 09, 2022 19:48

  Hi Yusaku

  If you are deploying the Eco at or near sea level, you do not need to have it in air prior to deployment.  This is because the position used to tag the deployment's location is actually when the Eco surfaces at the end of the deployment; that is, the first valid GNSS position after the last in-water sample.  This is by design to handle exactly the type of condition you are describing (i.e. set up instrument in office for future start date and have instrument start already underwater).  The logic is that the most accurate deployment position data is that which is collected immediately following the surfacing of the Eco.

  The only time you must start the Eco in air is when deploying it at high elevation (typically ~100 m above mean sea level) so it can properly apply an atmospheric pressure correction.  See "Is it ok to deploy an Eco in a high elevation mountain stream or lake?" FAQ in the Eco App.

  Finally, recall that, should the deployment location be incorrect (can happen if no valid satellite fix is obtained prior to terminating the deployment), you can always adjust the location in the Eco App's map.

  Comment actions Permalink

Please sign in to leave a comment.