Storing latitude and longitude

Hi:

One of my tables will store latitude and longitude information. I've
checked and I cannot see a datatype for that (which is no surprise, and
no loss). However, I can think of three ways to store the data:

 * Array field (degrees, minutes, seconds)
 * Three integer fields
 * Three numeric fields with up to 2 decimals each

Having one-second precision is good enough, so three integers will do.
Of course, ideally I'd have two integers and a numeric for the seconds
so I could have fractional seconds too.

Between separate fields and an array, first is an array possible? Can I
store that? If so, is there any performance or other benefit I should
know about?

Clearly this is not an important consideration (in fact I already
created the table with two integers and a numeric field), but I thought
I'd ask for the educational value of the discussion.

Cheers,

--
Rodolfo J. Paiz <rpaiz@simpaticus.com>