There are no tides on Tanoa. This is a missed opportunity, and the Arma engine did support tides long ago...
Realistic tides. Small islands in open ocean tend to have relatively small tides (around 1m for Fiji).
In Fiji, tides are a significant factor in navigation due to the extensive reefs. Reefs which break the surface at low tide can be safely traversed at high tide by small and shallow draft boats common to Arma and Fiji.