The frame

Lines of latitude and longitude cross the diagram. Together they make a grid. This line is 36° 40′ north. The line near the bottom is 36° 39′ north.

The two lines that run up and down show longitude. The left one is 121° 37′ west. The right one is 121° 36′ west. These lines run true north and south. So the top of this page is true north.

The straight arrow points to true north. It runs the same way as the longitude lines. The slanted arrow points to magnetic north. That is where a compass points. The label shows the difference. Magnetic north is 13 degrees east of true north.

The note below says the 13 degrees is from January 2020. It changes 0.1 degree west each year. The arrows are not the same on every diagram. This diagram has no scale bar. The scale is different on each diagram.

To measure distance, use the small ticks on a line that runs up and down. The space between two ticks is 6 seconds of latitude. One space is about 600 feet.

Step that space along the runway, one space at a time. It fits about 10 times. So the runway is about 6,000 feet long. The diagram prints the length, 6004 feet. Your estimate is close.

Positions on the diagram can be off by up to 600 feet. Use the ticks for rough distances only. Next, we read the runway numbers.