How to protect your units traveling over sea?

Yes: Combine your ocean-going convoys of ground units with several destroyer squadrons in the same stack. The single combined stack of destroyers and ground units will move at the constant speed of 27 kph. Then send a single destroyer (or submarine) squadron ahead of your main convoy to flush out any enemy units in the path of the main convoy. The vanguard destroyer or submarine squadron will move faster than the main convoy. Also, within range of land, you can also use aircraft units to flush out surface warships in the path of the convoy, and naval patrol bomber squadrons to detect submarines.

I'm doing something wrong my stacked destroyers don't travel at the same speed as my ground units.

JohnnyUtah13 wrote:

I'm doing something wrong my stacked destroyers don't travel at the same speed as my ground units.

Also be aware that neither a leading destroyer nor a leading submarine will detect an enemy submarine in "Hold Fire" fire control mode. For this, you need a Naval Bomber (Nav).

The good news is your aircraft carrier has room for Navs. You did build one, right?

Bad news is the game mechanic does not allow the Nav to be patrolling in a position relative to the Carrier. Instead it patrols relative to the fixed earth. This means you need to come on line periodically and adjust your Nav patrol patterns to be covering the area you are entering. Don't forget to watch for submarines coming in from the sides or sneaking up from behind.

@JohnnyUtah13: My answer above is the L1/L2 primer. F. Marion's answer is the L3 elaboration, with a measure of High Command sophistication mixed in.

MontanaBB wrote:

@JohnnyUtah13: My answer above is the L1/L2 primer. F. Marion's answer is the L3 elaboration, with a measure of High Command sophistication mixed in.

I have it down now. Thanks for the tips. It is really appreciated.

De rien, mon general amiral.