Rangefinders allow a golfer to measure exact distance to the hole from their current position; they are illegal according to Rule 14-3 of the rules of golf, but the USGA allows individual course clubs to institute a local rule permitting rangefinders, and they are common among recreational golfers. The typical rangefinder is an optical device that is aimed by sighting the scope on the flag and using the calibrated gauge in the optics to estimate the distance based on the flagstick's apparent height. Other rangefinders estimate range using a calibrated focus or parallax control; the user sights the target, brings it into focus, and reads the distance mark on the control. Newer laser rangefinders operate by simply sighting any target and pressing a switch to take a very precise distance reading using an invisible laser. Newer golf carts often include GPS tracking which, combined with an electronic map of the course, can serve a similar function.
Travel bags are available with many combinations of size and features, but are distinguished by rigid and/or heavily padded construction, including the clubhead cover (which on most other bags is simply an unpadded "rain fly"), and locks on the zippers and bag cover. These features protect the clubs from abuse and theft, and generally makes the bag suitable for checked airline luggage. Travel bags are generally used by amateur players that travel occasionally, such as business executives; rigid flight cases that enclose the actual golf bag are generally preferred by touring players, as these cases can enclose any golf bag, are more discreet as to their contents thus further deterring theft, and the case's weight and bulk can be left behind while on the course where it's not needed.
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