Charles Burchill

Several years ago I setup a navigation workshop for UofM Recreation Services. The following is the outline of the workshop.

This workshop will provide a basic introduction on the use of Topographic Maps, Compasses, and GPS receivers. It is primarily directed at those heading off into the woods and water ways. If you need help finding your car at the St. Vital shopping centre, or your friends house on Liberty Ave then this workshop might not be for you. The workshop is broken into two sections: 1. In class basic theory and 2. Field exercise.

Theory

This section provides a brief overview of topographic maps, compasses and GPS. It will cover some very general information on navigation and associated tools. Some other navigation related topics will be touched on such as: where reallly moss grows, using a watch to determine north (sometimes), following the stars, using the sun, why we walk in circles, and some other fun things that people do.

 General introduction to maps Topographic map Symbols and Features Reading contours Map scale Grids (Lat/Long, UTM (MGRS). MGRS repeats at 100,000m intervals so either identify map name/number or UTM Zone and grid reference. What is a datum and why should you care? Orienting the map and finding yourself (UTM/MGRS) In class task using UTM/MGRS Measure distance (string, straight line), determine slope. Traveling with a map (orientation, landmarks, features). Issues with maps (warnings, pitfalls, and other mistakes) Compass How a compass works (magnetic), types, parts The baseplate (orienteering) compass. This workshop deals mainly with this kind of compass. Bearing measurements - what is a bearing?: Degrees (360) Mils. For our purposes this divides a circle into 6400 units. This measure is primarily used to help compute a new direction based on an error in an old direction and is used when aiming artillery. The formula is: `   mils = lateral distance * (1000 / distance to target)` For example: a 12 mil change would result in a 12 meter movement per 1000 meters distance. Bearings, Baselines, Backtracking (a hobbits' story) How to take and walk a bearing (how to read compass) Issues and Limits (common pit falls and errors) Map and Compass Declination, Where is North? True, Grid, Magnetic - I am so confused! How much difference does it really make? Magnetic north moves; you need to adjust for time since publication. Compass (magnetic) bearing to Map (grid) Map (grid) to Compass (magnetic) bearing Finding your self (triangulation or X marks the spot), Base lines Issues with Maps & Compass together. GPS What is GPS, how does it work Should I really buy a GPS receiver? Location (only knows point) Transfer location to/from map How it measures speed & direction Getting & setting points and bearings for working with a map and in the field Issues and limits

Field

The field exercise will give participants the opportunity to try out the use of a map and compass in the field. The field portion is done at Assiniboine Park.

 Reading a map Finding location on a map, and going there Walking a line using a compass. Marking a bearing on a map & correcting for declination. Identifying your location on a map based on triangulation Using a baseline & finding a point along that line Identifying a point on a map, taking a bearing and walking to that point. Walking around objects and continuing Marking a point with GPS (find the point on Map) Find point on map and transfer to GPS. Finding a point with GPS and compass (get bearing from GPS, use compass to walk bearing) Finding a point with GPS alone

Map used in workshop (PDF file)

Numbered points on this map are the permanent orienteering course markers for Assiniboine Park. The course was setup by the Manitoba Orienteering Association Inc in cooperation with the City of Winnipeg Parks and Recreation Department.

Handouts

If you have any questions or comments please send me Email: burc...@cc.umanitoba.ca

Last modified: Sat Oct 23 07:13:08 2010