So the wizards in Forgotten Realms (back in the Netherese days) couldn't teleport to their flying cities unless they scryed them first or wanted to risk teleporting into the place in the sky it used to occupy? That's just plain silly. Too much science. Teleporting into a boat should be perfectly legal. Same with teleporting into the back of a wagon.
As for teleporting to the back of a flying dragon, that's a clever idea but really risky for reasons other than landing in the wrong place. Landing in the right place could be much worse ...
As for scrying the boat before teleporting, that might be a good idea. If the boat sank, then you would end up in the crows nest sitting 1000 ft underwater. Oops. If the boat was destroyed, then you would probably end up on some similiar boat in the region somewhere. Maybe thats an out of the frying pan into the fire situation.
As for preserving velocity vectors, that is also too much science. It should be perfectly valid to teleport to the ground if you fell off a 10000 foot tall cliff without hitting the ground at whatever velocity you were travelling when you teleported. Just ignore the science stuff and let people teleport where they want. Otherwise all the implications of even simple teleports need to be addressed too or else you have crazy inconsistencies. It's not worth the hassle, it adds nothing to the game, and doesn't significantly help game balance any. IMO.
As for teleporting to the back of a flying dragon, that's a clever idea but really risky for reasons other than landing in the wrong place. Landing in the right place could be much worse ...
As for scrying the boat before teleporting, that might be a good idea. If the boat sank, then you would end up in the crows nest sitting 1000 ft underwater. Oops. If the boat was destroyed, then you would probably end up on some similiar boat in the region somewhere. Maybe thats an out of the frying pan into the fire situation.
As for preserving velocity vectors, that is also too much science. It should be perfectly valid to teleport to the ground if you fell off a 10000 foot tall cliff without hitting the ground at whatever velocity you were travelling when you teleported. Just ignore the science stuff and let people teleport where they want. Otherwise all the implications of even simple teleports need to be addressed too or else you have crazy inconsistencies. It's not worth the hassle, it adds nothing to the game, and doesn't significantly help game balance any. IMO.