DIVE COMPUTER WITH GLOBAL POSITIONING SYSTEM RECEIVER

1 - 20 . (canceled)

21 . A dive computer comprising:

a processor;

a global positioning system receiver connected to the processor;

a display connected to the processor;

a pressure transducer connected to the processor; and

clock circuitry connected to the processor;

wherein the processor is configured to determine time using the clock circuitry;

wherein the processor is configured to determine depth of submersion using the pressure transducer;

wherein the processor is configured to generate position information using the global positioning system receiver;

wherein the processor is configured to provide depth and time information using the display; and

wherein the processor is configured to combine the time, depth, and position information into a dive log.

22 . The dive computer of claim 21 , wherein the processor is configured to calculate the amount of time a diver can remain at a particular depth without the need for decompression stops.

23 . The dive computer of claim 21 , wherein the processor is configured to calculate a decompression stop depth and a stop duration.

24 . The dive computer of claim 21 , further comprising a temperature sensor, wherein the processor is configured to determine water temperature using the temperature sensor.

25 . The dive computer of claim 21 , wherein the processor is configured to calculate when a diver can safety board an airplane.

26 . The dive computer of claim 21 , further comprising:

a memory system connected to the processor;

wherein the memory system comprises a plurality of memory units; and

wherein at least one memory unit is removable from the dive computer.

27 . The dive computer of claim 21 , further comprising:

a communications port connected to the processor; and

wherein the communications port is configured to communicate with external devices.

28 . The dive computer of claim 21 , further comprising:

an impeller connected to the processor; and

a compass connected to the processor;

wherein the processor is configured to determine speed and bearing using the impeller and compass.

29 . The dive computer of claim 21 , further comprising a buoy including a G.P.S. antenna connected to the global. positioning system receiver via a communication cable.

30 - 40 . (canceled)

41 . A dive computer, comprising:

a processor;

a pressure transducer connected to the processor;

clock circuitry connected to the processor; and

a global positioning system receiver separate from the processor and configured to generate position information;

wherein the processor is configured to generate depth and time information using the pressure transducer and the clock circuitry;

wherein the processor is configured to download position information from the global positioning system receiver; and

wherein the processor is configured to combine the depth and time information with the position information.

42 . The underwater computing system of claim 41 , wherein the processor downloads information from the global positioning system receiver over a wireless link.

43 . The underwater computing system of claim 41 , wherein the processor downloads information from the global positioning system receiver over a wired link.

44 . The underwater computing system of claim 41 , wherein the processor, pressure transducer and clock circuitry are configured to be worn on the wrist of the diver.

45 . The underwater computing system of claim 41 , wherein the global positioning system receiver is configured to attach to the diver or a diving apparatus attached with the diver.

46 . The dive computer of claim 41 , wherein the processor is configured to calculate the amount of time a diver can remain at a particular depth without the need for decompression stops.

47 . The dive computer of claim 41 , wherein the processor is configured to calculate a decompression stop depth and a stop duration.

48 . The dive computer of claim 41 , further comprising a temperature sensor, wherein the processor is configured to determine water temperature using the temperature sensor.

49 . The dive computer of claim 41 , wherein the processor is configured to calculate when a diver can safely board an airplane.

50 . The dive computer of claim 41 , further comprising:

a memory system connected to the processor;

wherein the memory system comprises a plurality of memory units; and

wherein at least one memory unit is removable from the dive computer.