With apologies to Bob Marley (for the Jamming reference)
Given the weather forecast it probably won’t be critical… but on Friday from 8AM to 5PM (local time) the UK Ministry of Defence has warned of deliberate interference to GNSS (GPS/GLONASS/Galileo etc.) signals in South Wales and possibly beyond if you are high enough up. So if your GNSS receiver of choice (mobile phone or dedicated device) goes a bit loopy you may have the MoD to “thank”.
How does Bob Marley like his donuts?
With jam in.
When Bob Marley’s wife left him, she took the TV.
No woman no sky!
What’s Bob Marley’s favourite book from The Bible?
Exodus.
Oh heavens… what have I started 
What did Bob Marley say when he put his hand in the bread bin?
Is this loaf
Is this loaf
Is this loaf that I’m feelin?
How often do experts say you should listen to Bob Marley?
Reggae-larly.
At least the idiots will have an excuse for following the sat nav off a cliff or into a river ! When I lived in Cornwall in the early 2000’s the Local Marine broadcast used to state there may be problems with GPS for exactly the same reasons ( Military exercises) There were also reports of the locations of some very large items drifting about ! I followed the reports of a leg from an oil rig that had fell off in transit and it was amazing how far it moved ! Weather forecasts was also interesting as it was always exactly right.