There is one downside to the current diplomacy map that we are using- the maps omits identifiers for coasts. I’ll describe them here and make some additions to screenshots of jDip with photoshop. Coasts are a way to prevent fleet’s from sailing across huge coastal provinces to the other side in one move.
Thankfully there are only three provinces that have different coasts:
Spain has a north and a south coast. When a fleet moves to Spain, it occupies one or the other, depending on where it came from. This also limits where it can move to in one turn. For example: A fleet on the north coast (pictured) cannot move in one turn to the Western Mediterranean (wes), nor can it move overland to the south coast!
Bulgaria has an east coast and a south coast. A fleet on the east coast (pictured) cannot move in one turn into the Aegean (aeg). Nor could a fleet on the south coast move in one turn into the Black Sea (bla). Finally, a fleet cannot travel overland from one coast to another.
St. Petersburg (stp) has a north coast and a south coast. A fleet on the south coast cannot move into the Barents Sea (bar), and a fleet on the North coast cannot move into the Gulf of Bothnia (bot). Nor can they move overland between coasts.
London looks like it has different coasts, but…
London looks like it has coasts, but it doesn’t! From London, a fleet can choose to move to either the English Channel or the North Sea.