How to Choose a GPS Receiver for Recreational Purposes (2)
Steps
4.If you prefer a vehicle/boat mount unit, examine sizes, possible mount locations, antenna configurations etc. that are right for you. Consult your retailer for options. Some marine GPSs come with built-in fish finder features as well.
5.If you prefer a handheld unit, consider the following additional features and how important they are to you:
Colour screen - More expensive, but some people find them easier to read
Battery requirement & consumption rate - how many batteries does it take, which type, and how long does it take to drain them? Would you prefer a rechargeable unit?
Electronic compass - telling what direction you are facing while you are standing still. GPS units without this can only report your direction when you are moving.
Barometric altimeter - calculating altitude based on air pressure
Mapping - Displaying your current position on a map, uploading extra/custom maps into your unit
Data entry - Some GPS units only allow you to upload waypoints from a PC, while others allow you to enter them while in the field
Communications - Some GPS receivers have built-in two-way radios (ie: walkie talkies) to allow for communications as well as navigation. These units may provide position-sending functions so that you can locate others in your party
Removable memory cards for maps - Some people prefer to be able to swap maps while in the field, rather than connecting their GPS unit to a laptop. You may purchase a GPS that provides a CompactFlash (CF) or SecureDigital (SD) slot for map cards if this is important to you.
the article source:http://www.wikihow.com/Choose-a-GPS-Receiver-for-Recreational-Purposes
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