Polarisation of GPS Signals - Significant?

[Slowboat35]

I'm planning an AIS fit and wondering if I rely on its on-board GPS antenna whether it matters 'which way up" I mount the unit?
Is polarisation important here? As I am not finding any advice on this from the makers I suspect not - but before I go ahead can the electronics experts here give their input please?

 

[Wing Mark]

Theoretically, GPS signals and aerials are 'circular polarisation' to provide rejection of reflected signals.
Since the aerial is supposed to have a field of view from horizon to horizon on both axes, that's a big ask.

I think the reality is consumer GPS is quite compromised and if you mount the aerial at a funny angle you may lose a satellite or two in some directions, but you'll probably see enough satellites to get by.
Do you have some urge to mount it completely upside down?

Do you actually mean 'polarisation' in the aerial bodging sense, or 'directivity'?

For civilian purposes, if you just give it a reasonable view of the sky it will probably be OK.

 

[LadyInBed]

Temporary mount it as you want, then 'suck it and see'!

 

[Buck Turgidson]

Polarisation means something else. I think you mean orientation.
Right way up if you want ti to have good reception. It might work upside down but don't be surprised when it loses signal.

 

[jwilson]

Polarisation means something else. I think you mean orientation.
Right way up if you want ti to have good reception. It might work upside down but don't be surprised when it loses signal.

The only convenient and neat place I could mount a Emtrak B923 was under the GRP deck, up against the deckhead, and upside down. It picks up GPS signals near-instantly.