GPS chip UC430 1.8v?

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http://www.fastraxgps.com/showfile.cfm?guid=c6ffc2f1-9814-4b50-b9df-4610134b37b7

do need connect grounds on p.30?  
18 of 'em!

looks simple circuit required.  only 5 pins including ground.  the inputs 3.3v tolerant.
simple voltage divider go 5v 3.3v?

gnd
1.8v
on/off
sda
scl

how read/write i2c data arduino if it's 1.8v?
logic level converter.  $12 shipping sucks...
any other ideas?

spec says i2c can pulled 3.6v.
i bet pulling 3.3v arduino fine.

yes on grounds - make nice ground plane reception.

trade off unit cost & shipping vs unit cost & shipping elsewhere, gps @ sparkfun
http://www.sparkfun.com/products/8975
which needs 5 connections.

here version on card in box
http://www.ontargetmarine.com/node/16


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