GPS RIP

[Fantasie 19]

This is not how they work at all. Individually the GPS receivers average out movement automatically. As I said above, if you enable two or more receivers on the same plotter it can cause flip flopping between them on some plotters (most use only one source at a time).
All modern receivers receive multiple GNSS sources as well, and will average the position between the multiple derived positions internally.

You'll know.. any idea why my GPS tracks sometimes shows me well above (and indeed below) sea level?? Not just me - my mate sees it as well when he's been kayaking...

 

[lustyd]

You'll know.. any idea why my GPS tracks sometimes shows me well above (and indeed below) sea level?? Not just me - my mate sees it as well when he's been kayaking...

Because of the way the triangulation works height is less accurate. The angle to satellites is almost the same on that plane while X and Y coordinates theres a big difference.

 

[dunedin]

Because of the way the triangulation works height is less accurate. The angle to satellites is almost the same on that plane while X and Y coordinates theres a big difference.

Plus of course places with large tides you can be well above or below mean sea level depending on tide height.

 

[lustyd]

Plus of course places with large tides you can be well above or below mean sea level depending on tide height.

And that, yes. Or in the canals also chart datum isn’t necessarily the same as geoid datum (Antarctic Pilot can probably give us all the detail there!)

 

[S04]

Because of the way the triangulation works height is less accurate. The angle to satellites is almost the same on that plane while X and Y coordinates theres a big difference.

It's actually trilateration but let's not quibble.