[PSUBS-MAILIST] gps and uw/ nav.

["Vikking" <vikking@mindspring.com>]

hello.

I have tried off the shelf equipment, for uw navigation, the units does not get a signal below the surface, not at least the ones i have use.

 

But the problem gets a little more complicated, because even if they do get a fix this data does not really accurate can be translated to the chart, since the charts available were not done using gps.

 

soundings on the other way, combinated whith a series of waypoints on a well established route, allowding for a corridor whit lateral check points will do for a practical aproach, since you can determine before hand at what latitude/longitude a particular bottom feature appears, you will be able to safely navigate, whithout a constant link to a gps,

 

a sonar whith fordward detection capabilitie seems to have prioritie since is this type of instrument plus your heading that you rely for the mayor part of the time, and when lost ,you can always surface and the gps will then get you back on track.

 

hey, hitech,is very goodas an aid, but to really work needs to be complement by your skills, my point is that even if we could get a gps signal underwater will it not be enough to navigate whith a good margin of safety, it is just another tool

 

Gabriel