I had a Garmin for years before I bought a mounted Garmin, They are great, I bought a power cable cause as stated they use a lot of batterys, but with ther power cable the batterys were just for back up.
I have a nice little handheld GPS plotter. It is a Lowrance Atlantis and was preloaded with charts and cost about 250. For me its a great back up unit.
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Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.