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I have a cure for that ... try navigating a course while swimming midwater (where you can't see the bottom) and holding a specified depth. For real fun, have one buddy do the compass work while the other monitors depth and time.amascuba:I have more hours in a pools then I care to count. It's easy to hover when you can see the bottom below you or fix yourself a point on the wall. It's a total different story when you have no reference point to watch while you are hovering.
gomi_otaku:How to get all my gear out of the house and into the van without my wife noticing.
TSandM:On the nav dive, Bob gives you a slate with a course: 130 degrees for 2 minutes, 300 degrees for three minutes, etc. He's plotted it out so it comes back to your starting point. I've never gotten to my starting point, because I usually only get two legs done before I get so disoriented I have to surface. Trying to swim a course on depth when everything in every direction is the exact same green is my idea of the 7th circle of you-know-where.