optional, single

—

With <maximumvisibility> the maximum visibility to be expected at the dive spot described is put into bracksts. The value is given in metres as a real number.

<sitedata>

—

<averagevisibility>, <minimumvisibility>, <sitedata>

(see also <sitedata>)

<!-- maximum visibility to be expected at dive spot is 10 metres -->
<maximumvisibility>10.0</maximumvisibility>