[Paddlewise] Garmin eMap question

Hey Garmin GPS users,
I've noticed the eMap due to its low cost and street map features, but I
also would like to use it in the yak. 
A review of it said: (http://joe.mehaffey.com/emaprevue.htm)
>There are a number of features important to hiking and marine use which eMap does not have.  The most >important are: 
>1) eMap is not submersion rated, just "rain resistant" and is not sealed. Water entry could cause eMap >failure. 
>2) Marine users likely would miss the "highway" cross track steering page which eMap does not offer. However, >if the unit is properly shielded from water, all the essential features for hiking are present. 
 
Obviously, the lack of waterproofing is a big concern. But I like the
map features and low price and am considering putting it in a VHF
radio-type waterproof bag and taking my chances. 

My question is, will I miss this "highway" cross track steering page
(whatever that is)? Is that a page you use often? Is there anything else
you notice about the eMap that would make it unsuitable for use on a
typical kayak trip?

Thanks,
Frank

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