Minutes and degrees
I'm a landlubber, used to contour maps with grids but the principle is the same with nautical maps. Hopefully I don't screw this up.
i.e. 65° 32' 15" = 65 degrees 30 minutes 15 seconds.
If you look on your chart you'll see the grid lines clearly marked with similar numbers(without seconds as the map is not that accurate), the lines themselves being actual degrees and the second number the minutes, each grid being divided into 60 minutes (they are not marked you'll have to guesstimate). The number on the horizontal lines is latitude (Lat) and the Equator is basically your zero line, latitude lines always being parallel to the Equator, the number on the vertical is longitude (Long, aka a meridian line), the zero mark being Greenwich, UK (Prime Meridian).
When finding a lat and long on a chart, it's basically "up/down the stairs and out the door"; up/down(depending on which side of the equator you're starting from) the horizontal (lat) lines (like a stair) and find the first number then left or right (depending on which side of the Prime Meridian) towards the vertical lines indicating the longitude (long) number.
Lat and Long are further clarified with regard to which direction by using North, South, East and West with the numbers.
e.g. Sydney, Austrailia is 33° 52' S and 151° 13' E
Obviously Sydney is South of the Equator and East of the Prime Meridian. Although I don't think the charts in the game use the letters.
Hope this helps.
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