The event will be run strictly in accordance with the published BOF and Government guidance. It is a condition of entry that all participants agree to adhere to the BOF COVID19 Participant Code of Conduct.


Opposite 135 Greenshaw, Brentwood, CM14 4YP

The start/finish area will be on the open area to the north of Greenshaw, near St. George’s Church. 




Nearest town: Brentwood

Directions / Parking

On street parking along Greenshaw.  Please park tidily.  The event will be coordinated from a nearby parked car or perhaps a table in the open air

Registration & Start Times

Start at times between 6.30pm and 7.30pm as confirmed by Event Coordinator. Please arrive and be ready for your agreed start time. Competitors must report to the finish by 8.45pm.

Course Information

Long Course  5.2k            Short Course  3.0k     These are direct distances between controls (and are subject to final controlling)

OOMap 1:10,000

Controls are a selection of street furniture, including Fire Hydrant Signs, Postboxes, Lampposts and Telegraph Poles.


You will be asked to record:

lower number on the hydrant signs
Second half of the Postbox postcode
Number from the Lamppost
Numerical Value from the Telegraph Pole

Please bring a pen or pencil to mark the control card and map bag if it is wet.

The course is on roads, pavements, footpaths and trails.  Please wear suitable footwear.

Explanation of colour courses

  • White are very easy with all controls on paths. They are mainly used by 6-10 year olds and family groups.
  • Yellow use simple linear features like paths, walls and streams. They are mainly used by under 12’s and family groups.
  • Orange progress to basic use of the compass and route choice. They are ideal for novice adults or experienced youngsters.
  • Light Green are ideal for improvers as the navigational difficulty begins to increase and uses simple contours and point features.
  • Green are used mostly by experienced under 18’s and adults wanting a short but challenging course with a very hard navigational difficulty.
  • Blue are a longer, more physically demanding course in comparison to the green. The distances are more varied between controls and the course attracts experienced orienteers.
  • Brown & Black are very physically demanding and have a very hard navigational difficulty. They are for experienced orienteers only.
  • Score means visiting as many controls as possible in any order in a specific time, like 45mins.

Entry Details

By email to the Series co-ordinator for HAVOC events 

You will need to provide the following information in your email:

Short or Long Course
Gender/Age Category (if unknown your age at your birthday this year)
Club (and BOF no. if applicable)
Preferred time slot, 6:30 – 6:45, 6:45 – 7:00, 7:00 – 7:15, or 7:15 – 7:30 (not guaranteed)
Payment details will be sent with confirmation of entry, or please confirm £10 paid for all 4 HAVOC events
Contact Tel No. – solely for the purpose of the Government’s Track and Trace system


£3 Seniors, £1.50 under 21 or students for just one event, or,£10 paid for all 4 HAVOC events

Electronic Pre-payment is required.  Details will be sent with the confirmation of entry.

Safety and Risk

A comprehensive risk assessment will have been carried out by the organiser, but participants take part at their own risk and are responsible for their own safety during the event.

Privacy: when entering our events your name may appear in the results section of this website or in newspaper reports.
Read our privacy policy to see how we look after your personal data.

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