[Wulfmann]

Map?
My RND mis file in the campaign folder is in notepad????

For the convoys, open the RND file, click, "edit", then click "find"
copy the Rnd Group 1 into the window and change the 1 to 61 (The convoys are 61-118). With the Rnd Group 61 in the window click "find next". This will take you to the first convoy.
Here is what a Hospital ship would look like:

[RndGroup 62.RndUnit 13]
Class=NHOS
Type=103
Origin=British
Side=0
CargoExt=-1
CargoInt=0
CfgDate=19390801
No=1
Escort=false
SpawnProbability=100
CrewRating=3

Except for the first line you could copy and paste this in place of any ship in any convoy and also to the single ships. Find those by putting 102 in the find window and click "find next". Replace the ones you want keeping the original first line as it is for the other ship being replaced and where you want an Anerican, change the British nationality.

I recommend you get Serg's additional merchants and edit them into the convoys. This drives you nuts because you can not tell them apart until you get under 1000 meters and that in the daytime.
You can add those to single ships and convoys by pasteing this:

[RndGroup 62.RndUnit 10]
Class=PTR
Type=103
Origin=British
Side=0
CargoExt=-1
CargoInt=0
CfgDate=19390801
No=1
Escort=false
SpawnProbability=50
CrewRating=3

Note, you can vary the probility from 10-100% as you choose for them spawning.
Just changing the 103 is not enough as the cargo load must be as above.
Good luck.

Wulfmann