in previous civ games, building a naval fleet was nearly pointless. Especially after railroads, while you can move ground units even 80 squares in a single turn, battleships were limited to 4? if i am not wrong it was taking 6 or 7 turns (two years?) to land American soldiers to Normandy in the WW2 scenario. 
And I am afraid things will not be much different for civ3. besides their limited movement capabilities, there is no real use for them. There are no merchant ships to protect for the main reason. You do not need to build a single ship to trade with a civilization that resides on a different continent. And you only need build a single trasport to send a worker to gather resources from a colony on an island. You do not need to build a fleet to protect trade routes. Of course enemies can make invasions and stuff but the real point is that they cannot issue blockades. If you want to cut off resource traffic of an enemy you have no other choice but to make an invasion which is not only unrealistic but also impractical even in terms of gameplay.
This is a little bit of shame for a game like civ3, dont you think so. World history is full of examples of how naval power determined the outcome of events. Think about the colonization era, World wars, to name a few. how did Britain managed to be a supreme power for such a long time, why did Japanese attacked Pearl Harbour.
I am not making any suggestions to fix this because at this stage of development i am pretty sure they will be ignored. But would not it be great to have a trade system like the "Imperialism" series; your trading capacity is determined by the cargo capacity of your merchant ships; and you have to defend your ports/merchants from enemy blockades.
Any comments?
-- my point is not to critisize fraxis, i am looking forward to play the game. just to make it better..

And I am afraid things will not be much different for civ3. besides their limited movement capabilities, there is no real use for them. There are no merchant ships to protect for the main reason. You do not need to build a single ship to trade with a civilization that resides on a different continent. And you only need build a single trasport to send a worker to gather resources from a colony on an island. You do not need to build a fleet to protect trade routes. Of course enemies can make invasions and stuff but the real point is that they cannot issue blockades. If you want to cut off resource traffic of an enemy you have no other choice but to make an invasion which is not only unrealistic but also impractical even in terms of gameplay.
This is a little bit of shame for a game like civ3, dont you think so. World history is full of examples of how naval power determined the outcome of events. Think about the colonization era, World wars, to name a few. how did Britain managed to be a supreme power for such a long time, why did Japanese attacked Pearl Harbour.
I am not making any suggestions to fix this because at this stage of development i am pretty sure they will be ignored. But would not it be great to have a trade system like the "Imperialism" series; your trading capacity is determined by the cargo capacity of your merchant ships; and you have to defend your ports/merchants from enemy blockades.
Any comments?
-- my point is not to critisize fraxis, i am looking forward to play the game. just to make it better..