- The first is the answer that should be written on the answer sheet.
- On an "A" board, the second is the position in the table of locations of the navigation for the corresponding "B" board.
- On a "B" or "C" board, the second piece of information gives you the missing information from the navigation for the next (C or D) board, which you should need in order to solve its location.
- Being at the top of its pyramid, a "D" board has only the required answer.
- There are two Control Marshal locations, at each of which you may perform a navigational task, which will be timed. These will be worth 20 points each, plus 10 points less 1 point per minute taken to successfully complete the task. Opening and closing times will be notified at the start of the event.
- As an additional tie break, after those listed in the regulations have been exhausted, ties will be broken in favour of the crew completing any of the control marshal tasks in the shortest amount of time.
- From this, the maximum achievable score can be calculated from getting Zero times at the two controls (2x30), six D boards (6x25), six C boards (6x20), twelve D boards (12x15), and twenty-one of the A boards (21x10). This adds up to 720 points. Novices please note that approximately three quarters of this target score should be achievable by plotting straight references or very easy navigation alone.
Target Score
Points can be scored from a maximum of 45 codeboards and the two control marshals. The target score is 720 points, which is the greatest score you can get by visiting only 45 CBs and the two controls. No merit will be attached to getting more than the target score. If answers are given for more than 47 locations (including the controls), then the highest scoring locations will be deleted until only 47 locations are left to count. Answers that are crossed out will be ignored.Navigation Types
We believe that the format of this event will keep you busy enough, without the need for complex navigation. There may be a small number of tricky clues at the start, in order to give some differentiation between expert crews.Note that where a clue shows a route, it is not necessary to drive that route; it is only necessary to visit the codeboard at the position in the route described in the preamble to the clue.
By easy navigation, we mean:
Map References:
Nice and simple eg 4131/2 5213/4 - and accurate. Plotted carefully, you will be able to tell which side of the road a codeboard is.As variations on a theme, we might do things like mirror image the reference 
, or give it in roman numerals IV I III I/II V II I III/IV. We could also offset it from a given point: eg clue is at 052 1/4 956 1/2 relative to the church in Sutton Scotney, which means that the clue is 5.225km East of the church, and 4.35km South. Simple maths could also be used: eg x=3, reference is x x-2 x x/6 x+2 x-1 x-2 x/x+1.
Herringbones:
Follow the route from the given start point to the location of the codeboard, from the ball to the arrow:
The herringbone may have both of its ends joined together (thus appearing as a circle), in which case you'll have to work out where to start - it will only work one way. We might also follow things other than roads, such as railway lines, transmission lines and grid lines.
Tulips:
These are representations of the junctions on the route from the given start point to the location of the codeboard. Balls and arrows may
or may not 
be shown, (once again, follow from the ball to the arrow), they may be traced off the map 
, or any combination thereof. If we're feeling really sneaky then they might be out of order - but you'll just have to work that out.
Trails of map features:
This will be a list of features passed on the route from the given start point to the codeboard location. They could be spot heights, letters on the map, bridges, or anything else like that. It should be pretty obvious.Spot Height Trails:
As a variation on the last type, trails of spot heights can have further games played with them. As well as just a straightforward trail:55 44 62 27 26 23 17 17 19 45
we could show the differences between the spot heights:
55 -11 +18 -35 -1 -3 -6 0 +2 +26
or we could just add them up as we go along:
55 99 161 188 214 237 254 271 290 335
Don't confuse a list of spot heights with a list of grid lines (see below), but note that we might mix them together, just to keep you on your toes.
Junction Colours:
This will be the colours of the roads at the junctions you go past on a route from the given start point to the codeboard location. The first colour given is the colour that you approach the junction on, and the last colour given is the colour on which you depart the junction:YRR RBBR RYR RRYY YYY YYY YYY YYY YYYY YYY YBYB BBY
In this example, you first come to a junction with one yellow road, and two reds, which you depart on a red road (but as yet, you don’t know which one). The next junction is a crossroads with two red roads and two browns, which once again you depart on a red road. Then you come to a junction where a yellow meets a red road, and you stay on the red road. The next junction is a crossroads between a red and a yellow, which you leave on one of the yellows. Then there is a string of four, three way, yellow junctions before you arrive at a crossroads where four yellow roads meet. It is at this point when solving the clue that you will probably end up with lots of different routes to try, and three or four fingers marking the different places you could have got to. As ever, there will be only one route. After that the route should be obvious since there is just one, all yellow, three way junction before reaching a crossroads with a brown road.
Directions at junctions:
This is where we describe the route from a given start location to the codeboard location by telling you which way to go at each junction, using the following abbreviations:| ML | miss a road on the left | MR | miss a road on the right |
| SL | slot left (ie. take a side road on the left) | SR | slot right (ie. take a side road on the right) |
| TL | turn left at a T junction | TR | turn right at a T junction |
| XL | turn left at a crossroads | XR | turn right at a crossroads |
| FL | take the left turning at a fork | FR | take the right turning at a fork |
| SO | straight on | SOX | straight on at crossroads |
| 1E | take the first exit at a roundabout |
Grid Line Trails:
This is where we list the grid lines which a route from the start location to the codeboard will cross:48 49 21 50 22 50 23 50 23 51 22 52 22 23 24 25 52
If we are feeling sneaky, then we will not put any spaces in between the numbers:
48492150225023502351225223242552
We may also not tell you the numbers; we may just indicate whether the grid line is horizontal or vertical:
H H V H V H V H V H V H V V V V H
Alternatively, we might tell you which direction to depart the square (North, South, East or West, alternatively, Top, Bottom, Left or Right).
As a variation on a theme, we might do a trail of grid squares instead,
4720 4820 4920 4921 5021 5022 4922 4923 5023 5022 5122 5121 5221 5222 5223 5224 5225 5125
Which when you take the spaces out could easily be either! - But once again, only one method will work. Watch out for the odd spot height being thrown in as well.
Tracings
This is where we trace a selection of features off the map, and it is up to you to find them, and hence the location of the codeboard. The tracing may or may not be the right way up, or mirrored, or even to scale.Clocks
This is where a time is given to indicate your direction at each junction on the route from a given start point to the codeboard. Normally the minute hand will point at the direction of approach to the junction, and the hour hand will give the direction of departure. Watch out for 24 hour clocks!See you on Saturday night.
Doug
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