Congratulations to Louise Bell on swimming between the West and Palace Piers (The Argus, Aug 29).

However, I am sorry to disappoint her but whoever advised Louise the distance is one nautical mile was incorrect.

One nautical mile is the equivalent of 1,852 metres whereas the actual distance is 1,000 metres. This can be confirmed by referring to the relevant Ordnance Survey maps.

-TM Sinnott, Hartington Terrace, Brighton