In reply to Mike-W-99:
Hi Mike, the weather and tide data is grouped into areas with a radius of 20 miles. If any crag in a weather area is set to Tidal (altitude=0) then the tidal data gets fetched for those coordinates next time the weather is updated, which is roughly every 4 hours. When you view a crag with an altitude under 25m and there's tidal data then the Tide tab gets shown.
So basically, you just need to set the altitude of one of the local crags to zero, wait a bit for system to update the local weather and then it should show on that and any local crag page.
Cheers, Paul.