A system is for determining a position on a golf course. The system has a master unit and at least one slave unit. The master unit and the at least one slave unit are adapted to communicate through a telecommunications network. The master unit comprises a receiver for a satellite navigation system, the receiver being operable at a fixed position on the golf course. The master unit is configured to: obtain a position determined by the receiver; process the displacement between the obtained position and the fixed position; and make the processed displacement available to the at least one slave unit through the telecommunications network. A slave unit then makes use of the processed displacement to improve positions determined by itself.

An embodiment of the present invention provides a green information measuring system, including: a first device configured to measure an electrical characteristic of soil through at least one electrode when a first condition is satisfied; and a second device configured to receive soil information of the soil from the first device and to transmit the soil information to a server when a second condition is satisfied.

A golf flag (1) comprising a pole (2) comprising a first upper region with a first extremity to which a flag is attached and wherein a second lower extremity of the pole (2), consisting of a transparent part or section (3) will coincide with the zone of the pole (2) closest to a hole (4) of the Green in its position for use. Thanks to the invention, it is possible to reduce the “slow play effect” in golf by making it unnecessary to remove the flag when executing the putt.

The present invention comprises a novel golf flagstick which complies with the official rules of golf and consists of a flagstick with a ball ejection cylinder located four feet above ground level. The ball ejection cylinder is lifted by hand or with the shaft or grip of a golf club to eject the golf ball from the golf hole without the need to reach into the hole and without any damage to the sensitive grass turf surrounding the golf hole. In preferred embodiments, the ball ejection cylinder is color coded to provide golfers with an indication of the position of the golf hole on the golf green (red: front, white: middle, blue: rear) and incorporates a reflective strip for easy targeting of the flagstick by commercial laser distance measuring devices. In preferred embodiments, the ball ejection cylinder easily snaps on and off of the flagstick allowing for easy changing of the cylinder color with the daily repositioning of the golf hole on the golf green.

A golf hole extender having an increased ball retention diameter is described. In at least some embodiments, the golf hole extender includes a main body, a golf hole adapter, a main shaft, and one or more retention flaps. Such a golf hole extender may also include a lifting device and a carry facilitating device. A golf hole extender is typically capable of adjusting how the game of golf is played on a particular golf course by adjusting a given golf hole, or golf cup, which is the ultimate target for hitting the ball into in a game of golf. The golf hole extender may capture within its structure a golf ball struck in the direction of the golf hole extender, thereby effectively increasing the size of the golf hole. In this way, golfers of varied skill can play on the same hole with the hole presenting varied levels of difficulty for the golfers of varied skill.

An apparatus comprises a shaft; an openable and closable canopy; and a plurality of upwardly extending holding chambers on an underside of the canopy. The apparatus is thought to be particularly useful as a golf chipping game, with golf balls being chipped into the holding chambers as target practice.

A golf flagstick assembly includes a ferrule, a first flagstick portion, a second flagstick portion and a connector fitting. The first flagstick portion has a first cross-sectional dimension. The second flagstick portion is separate from the first flagstick portion and has a second cross-sectional dimension. The second flagstick portion is oriented such that an end of the second flagstick portion is disposed toward an end of the first flagstick portion. The connector fitting extends between and operatively connect the first and second flagstick portions. The connector fitting has a fitting cross-sectional dimension that is less than the first cross-sectional dimension of the first flagstick portion and less than the second cross-sectional dimension of the second flagstick portion. Connector fittings and methods of assembly are also included.

A putting kit for teaching, learning and practicing the art of putting comprises an inline putting frame that has various voids to accept golf tees. The golf tees may be in a raised position so as to define are more narrow passage way for both a golf ball and golf club head. By narrowing such passages, a golfer learns to make more refined a accurate club swings, such that the apex of the arc of the swing occurs directly at the back of the golf ball. A portable target or moveable golf cup allows for many golfers or students to practice upon the same green. A bubble level may be attached to the portable target to show a student the slope of the green. A ball firing mechanism may be aimed by use of the inline frame with the fired ball demonstrating the slope of the green.

A ground hole cutter is presented. The ground hold cutter includes a mechanical actuator, a housing shaft, and an arm housed within the housing shaft and coupled to the mechanical actuator. The arm is configured to extend and retract relative to the housing shaft. The ground hole cutter further includes a cylindrical cutter coupled to the arm and configured to engage a ground surface. In addition, the ground hole cutter includes a power supply and a controller. The controller is coupled to the power supply, and configured to control extension and retraction of the arm by actuating the mechanical actuator such that the extension and retraction of the arm engages the cutting component to cut a hole in the ground surface.

An apparatus for demonstrating how golf balls interact with golf clubs includes a downswing plane, a club shaft attached to the downswing plane, a golf club head attached to the club shaft, and a collision-plane indicator attached to the golf club head wherein the collision-plane indicator illustrates the plane created by two intersecting lines that are in the direction of the path and the direction of the club face. Preferably, the downswing plane has an adjustable angle, and preferably the downswing plane swivels. Preferably the club shaft is pivotally attached to the downswing plane. Preferably the apparatus includes a removable golf ball with a spin axis through the middle of the ball, and with a black line across the middle of the ball that indicates spin direction perpendicular to the ball's spin axis.