GPS are they worth spending so much money if you use may be once a month?
If you only use it once a month, it's probably not a good investment unless you can find one for really cheap ~$120 or so...even then it's like $10/each use if you use it for a year! If you use it more often, it's a much better deal.
As for generally speaking, you can't go wrong with the Garmin of any level. I personally have a Garmin nuvi 350 and my dad has a Garmin nuvi 660. Both are solid GPS units and have great POI's and fast lock-on's and directions (even recalculating is fast). I originially debated buying a Garmin because it's so much more than the other brands (Tom Tom, Navigon, Mio, etc), but I'm really glad I did after hearing about the problems of the other brands.
OP, do you have a laptop? If your use is trully rare, you might consider bringing your laptop in the car. A laptop with mapping software and a 30 dollar GPS receiver is all you need. It's clunky, but manageable if your need is rare. You can probably spend $100 or so on hardware from ram-mounts.com to mount the laptop safely.
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