Get one
Bill. Get one. Just do it. You will NOT regret it.
Do you *need* one, no, probably not.
But you will never be without, once you have it. Trust me.
As for units, I have the Navman 5500i. Works great. I wish you had asked sooner because there was a GREAT rebate on this unit through the end of August. It basically cost me $315 for the unit, no external mountings, just add the C-map. As Dave said, the best part about it is that it's just power and ground to install (he knows, because he helped install mine!).
The best price I found for the Navman was $489. The same place sells the Standard Horizon for $571. Both are great units, and Dave listed pretty accurately the advantages and disadvantages...
But buy one.
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