Mapping icons?

[RumBum]

I'm making a map of a local dive site. This is not for a DM project but just because I want to do it.
Are there "standard" underwater mapping icons? For example, where a square always means a platform, or a circle means a wreck... ?
I've searched on SB and on the net and seems like every underwater map is done differently.
Thanks!

 

[Doc]

Not many standardized for recreational diving, per-se.

USGS Symbols

I have seen these in use quite widely: http://makingmaps.wordpress.com/2007/07/19/map-symbols-nautical-dangers/

 

[potato cod]

http://http://erg.usgs.gov/isb/pubs/booklets/symbols/topomapsymbols.pdf

Here's a link to the USGS topo map symbols--a little more complete than the USGS list above. Check out the right hand column on page two.

Just in case the link doesn't work it's at: http://erg.usgs.gov/isb/pubs/booklets/symbols/topomapsymbols.pdf