When will separating from the boat while sailing "stop"

[ral61 1]

Every so often, mostly from the Nautilus continent, sailing from sim to sim causes a "separating" from the boat & crash sailing, 

to be standing at the bottom body of water. What setting can stop this from happening?

[Rolig Loon 25,276]

Get a better boat?  Or slow down before crossing the boundary?

[ChinRey 5,841]

Good advice from Rolig as usual but she forgot to mention that your avatar also can be an issue. Every time you cross a sim border, you log off from one server and on to another. That takes a little bit of time and the heavier your avatar is (script load is particularly important here but items you wear matter too) the longer it takes and the higher the risk is that something goes wrong.

with a well made and well scripted boat and a low lag (preferably no mesh and definitely no scripts) avatar you shoudn't have that many sim crossing issues although you never know of course.

[Dean Haystack 115]

You have to remember your boat and your avatar are 2 different entities, when you sim cross you are being transferred from one CPU to another in the LL servers.
You'll often hear people tell you to de-script as much as possible but this can be counter productive, imagine your avatar is full alpha with no scripts, it will get transferred quickly and be placed... ?
No where, since your boat will take a lot longer to get there. That is how you get separated from your boat. Mind you the reverse can also happen, so don't go loading on scripts in your avatar just because. The take away here is, this will always happen and sailing in SL is only worth it for the social aspect and as a part of something much bigger than just that, there will be video games a lot better suited for the sport, in SL, do it for the friends and when you do crash make a joke out of it for a laugh.

[Nalates Urriah 4,842]

Along with reducing attachments and scripts try to avoid crossing at or near region corners. The idea is to avoid quickly passing from one region through a second region to enter a third region. Doing so greatly increases the chance of a problem.

[animats 3,160]

This is a long-standing server side bug. LL has been unable to fix it for at least five years. If you do everything right, you'll still hit it about once an hour of travel. If you do everything wrong with avatar and vehicle, much more often. I put a lot of effort into the vehicle side over a year ago, and now how to make vehicles well-behaved is better understood. But it can't be fixed from the vehicle side alone.

Biggest long-standing bug in Second Life. Messes up Drivers of SL rides, GTFO, naval battles, flying, and just traveling around the world.

See https://jira.secondlife.com/browse/BUG-214653

Go to Server User Group on Tuesdays at 1200 SLT in Denby and complain. It's embarrassing that this isn't fixed yet. Keep the pressure on LL.