Posts: 193
Threads: 20
Joined: Jan 1970
I'll second chan tran on this-
while the 42 can certianly do most of what you need (likely all with the 32k upgrade), and the 41 certainly can, the 48g/gx will be cheap, easy to backup (glenn does it through the IR link direct from calc to calc)- and you cna still get all the environmentally sealed usable packaging to use it in adverse conditions. Last I checked, the surveying specific providers still had a ton of that stuff.
there are/were also some airplane navigation pacs made, not sure if there were and nautical ones, but I know there are some astronomy apps floating around.
the 48 series takes a lot of flack here, but you won't find a better general purpose solution with 2 spares for under $400, AFAIK