What is shown as the motto of the Royal Regiment of Artillery - Ubique (Everywhere), is not their motto, but the Regiment's Battle Honour. This signifies that the Regiment has served everywhere the British Army (and Royal Marines) have served in support of their fellow soldiers and marines.

The actual motto of the Royal Regiment of Artillery is on the scrolls underneath the field piece (a 9 pounder, I believe) is:

Quo Fas et Gloria Ducunt

Where Right And Glory Lead Us

Thanks, I'll change it the next time I update the site..