GPS receiver has a 24 hour a day line-of-sight view to a ample number of satellites at any spot on the earth such that an individual with a GPS receiver is able to find out their own longitude and latitude to inside several meters, in addition to their elevation. Dead-reckoning is well generally known as a technique of guiding ships, whereby the known velocity and direction of journey of a ship from a known place is used to calculate the present place of the ship. Adverse weather situations may also erode the accuracy of navigation by lifeless-reckoning. U.S. Pat. No. 5,781,150 to Norris discloses a tracking device having an RF transmitter and an RF receiver, each of which have a constructed-in GPS receiver. GPS place through an RF sign to the receiver, Tagsley wallet tracker which in turn calculates the place of the transmitter relative to that of the receiver. "line of sight" from its antenna to a receiver for dependable transmission is topic to potential sign loss when operated on the floor of the sea.

Waves can obscure the direct line of sight of the antenna, and may are likely to submerge the transmitting antenna. This is particularly true for a transmitter that is worn or carried by a person floating on the surface of the water. Transmission of a sign, similar to an RF sign, might be obscured by waves, Tagsley wallet tracker and the transmitter can be topic to immersion, resulting in wasted power and signal loss. This ends in shortened transmitter battery life and decreased transmission reliability. Additional embodiments of the current invention can present an elevated stage of confidence that the placement indicated for the individual or object is accurate. GPS receiver, a signal transmitter to send a sign indicating a position of the goal unit, Tagsley wallet tracker wallet card and a processor to calculate an optimal time interval for transmission of the signal. GPS sign receiver, a compass to offer a reference course of the locating unit, a sign receiver to receive the signal despatched by the transmitter of the goal unit, a processor to calculate a variety and bearing from the locating unit to the target unit, and an indicator to display the range and bearing.

GPS receiver and a sign transmitter to ship a signal indicating a place of the goal unit. GPS sign receiver and a compass to offer a reference route of the locating unit. An indicator shows the range, bearing and confidence stage. GPS receiver to determine a position of a machine. GPS receiver to determine a place of the goal unit. GPS signal receiver and a compass to provide a reference direction of the locating unit. An indicator displays the vary and bearing from the locating unit to the target unit. GPS sign at a goal unit to determine a location of the goal unit, receiving a GPS sign at a locating unit tracking the target unit to determine a location of the locating unit, calculating an optimum time interval for transmission of a signal from the goal unit to the locating unit, where the sign consists of the GPS location of the target unit, transmitting the sign from the target unit to the locating unit through the optimum time interval, and calculating a spread and bearing from the locating unit to the goal unit.

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