3.1 MAP SKILLS AND CALCULATIONS 3.1.1 The scale of the orthophoto map: A 1 cm represents 100 m B 1 cm represents 100 cm C 1 m represents 500 cm D 1 cm represents 500 cm 3.1.2 The coordinates of the stadium at F in block B4 on the topographical map is approximately .. - NSC Geography - Question 3 - 2023 - Paper 2

The approximate coordinates of the stadium are C: 33°56'19"S and 25°36'00"E.

To calculate the distance, use the formula:

$Actual\, distance = Map\, distance \times Map\, scale$

If the map distance measured is 14 cm, and since 1 cm represents 100 m:

• Convert the map distance to actual distance:

$14 \, cm \times 100 \, m/cm = 1400 \, m$

The runway appears larger on the orthophoto map because it has a bigger scale (1:10,000), indicating that the orthophoto map portrays a smaller area in more detail than the topographical map, which has a smaller scale, thus making features appear smaller.

The magnetic declination for 2023 is calculated as follows:

Mean annual change = 12' (westwards) Total annual change = 2 years x 12' = 24' For 2023, estimate the total deviation as 29°00' + (24'/24') = 29°24'.

Calculating magnetic declination for the current year helps in understanding the difference between magnetic north and true north. This information is critical for navigation and for ensuring accuracy in compass readings.