One message of All Is Lost, J. C. Chandor’s excellent film about an aging sailor fighting for survival at sea, is that the hero suffers even thoughhe does everything right.

At least that’s how it has seemed to critics, who frequently note how the protagonist—referred to simply as “Our Man” in the credits and portrayed with Oscar-worthy grace by Robert Redford—“clearly has the skill” to ply the open seas alone.

My fellow sailing experts and I saw things differently, however. To us, it was apparent that Our Man would have fared better if he’d avoided some rudimentary errors.(Warning: Spoilers ahead!)

We’ll share our observations in a moment, but first, a word about our credentials: I grew up competing and coaching on the Long Island Sound, and I learned much of what I know from Simon Karstoft Jensen, who competed on the Danish Olympic 49er sailing team (he currently heads up interactive sailing company Halcyon), and Timothea “Timmy” Larr, a 2013 National Sailing Hall of Fame inductee. The three of us saw the film, which is now out nationally, last week.

Had Our Man followed these six simple rules, all might not have been lost.

1. Never intentionally T-bone a large, heavy object. The action begins with Our Man waking up to water gushing in through a hole in the hull formed by a collision with a stray shipping container. There are two problems with this. First, you can feel every subtle shift on a sailboat, so there is no way Our Man wouldn’t have felt the initial impact and immediately woken up. Second, the hole appears to be above the water line, meaning the water wouldn’t have gushed in like that.

Leaving those issues aside, Our Man’s solution to the problem is itself problematic. To release the stuck container, he drops his sea anchor from its edge to lower it into the water. This would be unlikely to work, but it’s also unlikely the container would have gotten stuck in the first place. Then, once Our Man is free, he returns in an effort to retrieve the anchor and crashes bow first into the container. This is not advisable, as a head-on impact could cause an additional, even larger hole in the hull. The proper technique would have been to approach the leeward side of the container, luffing the sails to slow down, and attempt to tie up to the container in order to retrieve the sea anchor.

2. Don’t leave the gaping hole in your hull unattended. Before returning to the container to retrieve the sea anchor, Our Man jibes over, putting the hole on the leeward side to return to the container for the sea anchor. This is dangerous. The proper procedure would be to position the hole on the weather side so that it stays above water. He also should immediately stuff the hole with a mattress, sail, floorboards, or whatever he can find just to fill up that hole. Then he should start bailing the water out with buckets. Pumping by hand leaves him exhausted. If you are in this situation, once you have the boat under control, you triage—check for other leaks. Did the container hit below the water line? Is there water coming in somewhere else?

3. Never switch to the storm jib in the middle of a storm. The time for that is earlier, when the clouds are still rolling in. If you are caught in a storm without a storm jib, it is best to deploy the sea anchor, and then stay below deck.