Bearing Taking 101

Now that we know what a Navigation Contest is, let's get down to the bottom line.

It's time to apply what we've learned to a real time situation and use our old friend Sixty DStreet (60D = ST). Knowing exactly how much time we have from the Traverse or Time Plot, and knowing how to derive our speed from the Speed Curve provided by the Skipper, the leeway we can expect, where the finish line is, and our latest edition charts, we have all the information we need except for one equally critical element. Our position. Exactly where we are now! This we must accomplish by taking bearings as the primary source of positioning during the Nav Contest. In order to win we need to be using good equipment, taking accurate readings, and communicating precisely with our navigator.

Equipment:

I . Handheld pancake compass is best used for emergencies. Perhaps attached to PFD. As an accurate instrument for a Nav Contest, the handheld pancake needs to be relegated to the circular file 13.

2. "Autohelm" Flat NavCard has been used successfully by some of our teams, especially after they have been affixed to a good pair of binoculars. Generally, however, the "Autohelm" is used by pointing it in the general direction of the landmark in question and produces a dubious bearing. The "Autohelm" is best suited for the aforementioned file.

3. The US Army "full military specification" handheld field compass with aiming guide works very well and has produced District 5 championships. The card is floating in glycerin, thus minimizing error. Preferably a deviation table should be established for this device. However, its construction and design minimize the effect of onboard deflectors. The Army field compass will serve you well in rough seas where a stable platform is almost impossible. When all else fails, the device will get it done. Remember, a soldier in the field needs to know his location exactly, or he could be having lunch with the wrong bunch. This is his means of survival.

4. The KVH monocular bearing and range finder (KVH Datascope) is the premier device. It does pose a problem in heavy weather because the magnification it provides in identifying a measurable object, also magnifies the motion and ability to get a good bearing. In calm to moderate weather the KVH is extremely accurate for bearings while compensating for deviation, and also gives you the added benefit of range/height of object bearings. This can be most beneficial if you have reduced visibility.

Communications:

I . On contest day, venture out early enough to identify the best chart features to use, and establish the nomenclature you will need to make sure the team is on the same page.

2. Take bearings as often as requested by the navigator on all legs. This will give you the necessary confidence for that all important position determination on the last turn home.

If you don't know where you are exactly at that point - YOU LOSE!

What is a Nav Contest

What you need

Timekeepimg

back to Nav Contests