No user logged in, 16th Jul 2019

Was this article helpful?

29th Jan 2010
4.1 / 5.0 (17 votes)
TrackLogs Digital MappingTrackLogs Digital Mapping

Calculating your position using crossbearings.

TrackLogs Digital Mapping

To find your position using crossbearings you will need a sighting compass and two visible landmarks whose position you already know on the map. For example, you may be on a large mountain slope with two visible summits but not sure of your exact location on the slope.

1. Sighting the first Landmark

Sight your compass towards the first landmark. Turn the compass housing to align the north pointing needle with the red arrow on the base of the compass housing.

2. Mark the map for the first landmark

Place the compass on the map with the edge of the baseplate coinciding with the location of the first landmark. Turn the whole compass around this point until the straight lines marked in the bottom of the compass capsule are parallel with the north/south meridians on the map.

Draw a line on the map along the edge of the base plate from the first landmark. Your position will be somewhere along this line.

3. Using the second landmark

Repeat the procedure using the second landmark. Your current position is where the two lines cross.

Hint : You can use additional known landmarks to increase the accuracy of the crossbearing technique. The accuracy of the technique is also affected by the angle between your position and the two landmarks. If possible choose landmarks which are close to 90 degrees apart.

Written by TrackLogs Digital Mapping. Copyright TrackLogs Digital Mapping 2002-2019. All rights reserved. Please send any comments, questions or feedback to support@tracklogs.co.uk

Contact Us

Need assistance? Send your questions to our online support teams.
Read More

My Order History

Track current orders and view your complete order history.
Read More

Movie Tutorials

Sit back and learn how to use our software with online movie tutorials.
Read More

Knowledge Base

Search our knowledge base for answers to your questions.
Read More
We accept all major credit and debit cards
Order online before 3pm for same day despatch