DPlan - Ascent / Descent Rates

You may specify Ascent and Descent Rates for both deep and shallow segments of a dive, along with a "split" depth in feet. Rates may be set between 10 and 100 feet per minute; no negative numbers. Un-checking the boxes disables Ascent / Descent modeling. This is not a good idea but is sometimes useful for comparing with old square-profile schedules and softwares. By default, only the first big descent is shown in the profile, the rest are suppressed from the display. If you want to see everything, check 'show'.


8-D-cell light with lantern grip
8-D-cell light with lantern grip
now extinct

In the murky waters off New Jersey, you are going to need a powerful dive light if it is to be of any real usefulness. There are many different types of underwater lights to choose from.

Bulb Type

Nowadays, LEDs are the only way to go. They are cheap, bright, and efficient. They throw a white light that is much better than the dingy yellow of the old incandescent technology. Incandescent lights are completely obsolete. HID lights were never reliable, and terribly expensive.

Beam pattern is probably more important than brightness, Your main light should throw a wide beam, for area illumination. Many lights throw a narrow pencil beam that appears to be brighter but is actually less useful. These are best used as backups and in special situations, such as camera strobe aimers. Some lights are adjustable.