http://www.liveleak.com/view?i=096_1400895746

Stuff like that is the reason I have a GPS.

 

Then the only thing you have to worry about is the guy depending on his radar to fly past you at full throttle!

Looks like the item has been deleted due to a copyright violation.

 

In any case, electronics gizmos are your friends provided you use them properly.  When navigating in a thick fog, using your GPS to track your progress, keep this in mind.  It only tells you where you are, and where you've been.  It does not tell you if there are other boats in your area, or if there is hazardous debris on or just beneath the surface of the water.  Travel at a speed that allows you to do so safely within the range of visibility.

 

If you cannot see your hand in front of your face, you need to be idling along, and keep an eye on the depth as well.  It should be the same as shown on the chart shown on your display.  If there is a discrepancy between what the map says the depth is at your current position, and the depth reading on your unit exercise extreme caution. 

 

That's why electronics map makers have the disclaimer that the product should not be used for navigation.