Method and apparatus of marking objects in images displayed on a portable unit

A portable unit located in a first position comprising:

• a plurality of markers placed on a stationary map identifying a corresponding plurality of destination locations;
• a screen of the portable unit displays a portion of the stationary map, wherein
• at least one marker is visible on the screen;
• and
• an arrow displayed on the screen for each corresponding marker not visible on the screen, each arrow configured to point in a direction to its corresponding marker, wherein a movement of the portable unit from the first position in the direction of one arrow selected from all arrows displays a previously unseen portion of the stationary map on the screen, all remaining arrows continually adjust themselves to point to their corresponding destination locations, and the movement in the direction of the one arrow continues until the stationary map containing the marker corresponding to the one arrow is displayed on the screen.

A portable unit located in a first position comprising:

• a plurality of markers placed on a stationary map identifying a corresponding plurality of destination locations;
• a screen of the portable unit displays a portion of the stationary map, wherein
• at least one marker is not visible on the screen;
• an arrow displayed on the screen points to the at least one marker, wherein
• the portable unit is moved from the first position in the direction of the arrow and the movement in the direction of the arrow continues until the stationary map containing the at least one marker is displayed on the screen;
• and
• an inertial guidance system having at least one 3-axis accelerometer sensor configured to provide acceleration information of the portable device and at least one 3-axis gyroscope sensor configured to provide orientation information of the portable device, wherein
• at least one microprocessor is configured to calculate a newly calculated position of the portable unit based on the acceleration information and the orientation information and configured to display the stationary map corresponding to the newly calculated position on the screen of the portable unit.

A portable unit located in a first position comprising:

• a plurality of markers placed on a stationary map identifying a corresponding plurality of destination locations;
• a screen of the portable unit displays a portion of the stationary map, wherein
• at least one marker is visible on the screen;
• an arrow displayed on the screen for each corresponding marker not visible on the screen, each arrow configured to points in a direction to its corresponding marker, wherein
• the portable unit is moved from the first position in the direction of one arrow selected from all arrows;
• and
• at least one memory buffer configured to store the portion of the stationary map being displayed on the screen of the portable unit or configured to prefetch any portion of the stationary map corresponding to a newly calculated position of the portable unit after being moved from the first position.