What could have countered the Royal Navy at Algeciras?

What force could have challenged the Royal Navy's influence at the Algeciras Conference?

Nothing comparable at that location; only moving the conference near a massed German army could have provided Germany with an equivalent demonstration of power.

Geography was part of diplomatic power at Algeciras. Britain could assemble fleets near the conference while Germany could not bring its army to bear without crossing great distances and other states. A conference in Belgium or another location beside a major German exercise might have reversed that balance by making land power the dominant visible threat. The setting of negotiations could determine which country's military strength appeared most credible.