gps-ers... what chip for potomac/chesapeake

[fishinjim]

got the navionics lake maps east in my gps right now.  has no coverage of the potomac or chesapeake.
i was going to get the navionics classic upper chesapeake chip.  covers both upper chesapeake and potomac (US822L).
for those of you who are gps'n round here, what chip(s) are you using?

how bout for the delaware river?  anyone bother to get one of these?
looks like i'll have to fork out another 100 or so clams to get a seperate one for that (US824L).

[bassboogieman]

You need the coastal chip.  Navionics is $149 or $199, I forget.  It's much more expensive than the regional interior maps.  But you get out to the CANYONS!  I haven't bought it, I can't convince myself it's worth it............ So you buy it and let me use it a couple days until I can convince myself  ;D   THANKS!