GPS receiver has a 24 hour a day line-of-sight view to a sufficient variety of satellites at any spot on the earth such that a person with a GPS receiver is able to find out their own longitude and latitude to within several meters, in addition to their elevation. Dead-reckoning is effectively often called a technique of guiding ships, whereby the recognized velocity and direction of journey of a ship from a identified place is used to calculate the current position of the ship. Adverse weather circumstances may erode the accuracy of navigation by useless-reckoning. U.S. Pat. No. 5,781,150 to Norris discloses a tracking device having an RF transmitter and iTagPro official an RF receiver, each of which have a constructed-in GPS receiver. GPS position through an RF signal to the receiver, which in flip calculates the place of the transmitter relative to that of the receiver. "line of sight" from its antenna to a receiver for reliable transmission is topic to potential signal loss when operated at the surface 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 especially true for a transmitter that's worn or carried by a person floating on the surface of the water. Transmission of a sign, comparable to an RF sign, can be obscured by waves, and the transmitter will be subject to immersion, leading to wasted vitality and sign loss. This leads to shortened transmitter battery life and decreased transmission reliability. Additional embodiments of the present invention can present an increased level of confidence that the placement indicated for the individual or object is correct. GPS receiver, a signal transmitter to send a sign indicating a place of the target unit, and a processor to calculate an optimum time interval for transmission of the signal. GPS sign receiver, a compass to offer a reference route of the locating unit, iTagPro technology a signal receiver to receive the signal sent by the transmitter of the target unit, a processor to calculate a variety and bearing from the locating unit to the goal unit, and an indicator to show the vary and bearing.

GPS receiver and a sign transmitter to send a signal indicating a place of the goal unit. GPS sign receiver and a compass to provide a reference direction of the locating unit. An indicator portable tracking tag displays the range, bearing and iTagPro device confidence degree. GPS receiver to find out a place of a gadget. GPS receiver to find out a place of the target unit. GPS signal receiver and a compass to supply a reference route of the locating unit. An indicator portable tracking tag shows the vary and bearing from the locating unit to the goal unit. GPS signal at a goal unit to find out a location of the target unit, receiving a GPS signal at a locating unit tracking the goal unit to find out a location of the locating unit, calculating an optimum time interval for portable tracking tag transmission of a signal from the target unit to the locating unit, the place the signal includes the GPS location of the goal unit, portable tracking tag transmitting the sign from the target unit to the locating unit during the optimum time interval, and calculating a spread and bearing from the locating unit to the goal unit.

GPS receiver and portable tracking tag a sign transmitter to send a signal including a position of the monitoring unit. Preferred embodiments of the portable tracking tag device of the present invention can provide increased reliability of sign transmission from a transmitter to a receiver, and iTagPro features elevated confidence within the accuracy of the signal being sent. FIG. 1 is a schematic representation of a prior art private tracking system proven in use in a man-overboard situation. FIG. 2 is a block diagram showing the parts of a private monitoring system in accordance with the current invention. FIG. 3 is a plan view of a most well-liked embodiment of a graphical display of the private monitoring system of FIG. 2 . FIG. Four is a plan view of another embodiment of a graphical display of the non-public tracking system of FIG. 2 . FIG. 5 is a block diagram showing the elements of a personal monitoring system in accordance with an alternative embodiment of the present invention.

FIG. 6 is a block diagram displaying the components of a personal monitoring system in accordance with yet one more alternative embodiment of the present invention. FIG. 7 is a block diagram showing the components of a personal monitoring system in accordance with an additional various embodiment of the current invention. 2 is shown in FIG. 1 in a man-overboard situation. Four having a GPS system 6 is shown on the crest of a wave. 8 having a GPS device 6 is shown at the trough of a wave. GPS gadgets 6 embody a transmitter that sends a sign 10 , e.g., an RF sign, iTagPro geofencing to a GPS machine 12 on a ship 14 . GPS device 12 has a receiver to obtain the signals 10 sent by GPS gadgets 6 . Each of the GPS gadgets ascertains its longitudinal and latitudinal place by buying alerts from GPS satellites 16 that orbit the earth.