I downloaded this;

http://www.nexusmods.com/oblivion/mods/45794/?

And installed, the boat is near Bravil as advertised. Description says it "comes with a summon spell" but when starting a new game there's no summon spell. Looking at the ESP file in CS, there is a SailboatSummonSpell and two scripts;

scn aAddSpellSailbScript

begin gamemode

if (player.hasspell SailboatSummonSpell == 0)
player.addspell SailboatSummonSpell
endif

end

Next one;

scn aaSailbSummonScript

Begin ScriptEffectStart

aWWref.moveto player, 100, 0, 0
End

Begin ScriptEffectFinish

End

Problem is whatever I do after starting a new game there's no SailboatSummonSpell in my character's spell list. Go to Bravil, click on boat, sail someplace and dismount, then fast travel to Anvil lighthouse and "Your horse is stabled outside the city gate". The boat is classed as a horse so it can be "ridden" but it seems rather silly to ride it around the town on dry land to get it to the water - it would be more realistic to summon it in the harbor. But for some reason the script that's supposed to add SailboatSummonSpell to the player isn't working. Any ideas?

"HasSpell" is an OBSE command, and from your signature, you can't use OBSE.

"HasSpell" is an OBSE function.

EDIT: PrinceShroob was faster