"McMeikan, Andrew" wrote:
>
> The subject says it all and if it is feasible we could even get rid of the
> [OT] ;)
>
> how hard would this be?  Just need and LED direction indicator to find the
> way back to the boat, so accuracy would not have to be better than a few
> meters over an hour of swimming (boat would probably drift anyway).
>
> Is this reasonable on a PIC or better suited to an HC11.  Are there reject
> accelerometer modules that are not good enough for helicopters (a source of
> crashed ones?) but would be OK for diving?  I am thinking cost on this one.
>
> Is there another way (pitot (sp?) tubes??, under water GPS type boat
> produced ultrasonics?))

It's really early AM, but...

I wonder if you could detect a 'ping' from the depth finder.


--
Best regards

Tony

http://www.picnpoke.com
mailto:sales@picnpoke.com