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A 34S perhaps?
Not that they are immediately relevant to you, but the library has ECEF coordinates to lat/long conversions.
- Pauli
Posts: 1,322
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Joined: Jul 2005
There were commercially available programs to convert UTM (& Lambert) to local coordinates on the 41 and 48, so i know the 50 could do it. I haven't seen anything too wrong with the 50. Precision Survey Solutions uses it, so it must be at least passable, but they do protect it well in that battle case.
If you can program in RPL; the 48G usually goes for as cheap as $30 and your routine should fit easily in 32k. It would have the obvious advantage of outputting Northing, Easting, Depth, and four other things without R/S-ing. Input would be easily reviewable too. Since it sounds like you are using this near salt water; occasionally there are those TDS environmental cases for the 48 series on ebay. It's easy to fit a zip lock baggie for them too.
Addendum: Sorry Paul. How could i have forgotten the 34s? Plenty of room in 2k of RPN for his needs, and a Promptable/Labelable screen. The screen on my 20b based unit took a dump so i wasn't thinking of it.
In other news: I just got my dm15cc today and i must admit; i'm a victim of new love.
Edited: 14 Aug 2012, 12:06 a.m. after one or more responses were posted
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If you don't need a powerful solver, I think that you can do the whole programming more easily on a Casio fx-5800p. Around 28kB, it's the cheapest (TAS), and currently in production, has a clamshell cover, and needs just one AA battery (User's guide). Bad news is you need another one if you are willing to backup your programs. Good news is you won't regret losing it... and should withstand some abuse.