Missed DiRectiθn (Epilogue): Intersections Mystery Cache

This is a mystery cache and is not at the posted coordinates. It's very wet there.

Although part of the Missed DiRectiθn series, this is a standalone puzzle and does not requiring solving any of the others in the series. Certain circumstances inspired the creation of this additional challenge.

GC45K32 - Missed DiRectiθn #1: The Foot

GC44NBR - Missed DiRectiθn #2: The Yard

GC45K39 - Missed DiRectiθn #3: The Meter

GC45K3F - Missed DiRectiθn #4: The Smoot

GC45K3P - Missed DiRectiθn #5: The Final

On to the puzzle...

Intersections

In surveying, "intersection" and "resection" are methods to fix a position of an object or landmark by measuring the bearings between two or more known objects, then drawing lines of position along those recorded bearings.

The intersection method involves the collection of bearings to an object of unknown position from two distinct known locations. Within measurement error, the intersection of the two lines of bearing (as drawn on a map) are sufficient to fix the object relative to the two observation points. If the distance between the observation points is known, then the range from each observation point to the third location can readily be calculated. In this way, subsequent points can be surveyed and positioned.

A few months ago, I misplaced my cherished compass, one most accurate and expensive, and I never expected to see it again. Amazingly and mysteriously, it was returned to me recently. Whil I was ecstatic over the return of my precious companion, it was obvious that rough handling, severe negligence, and shameful disregard for such a valuable device left it in extreme disrepair. It appeared to have been taken, stomped on, and buried deep at some point.

Nevertheless, not wishing to spend the cash to replace it, I decided to take it outside to a remote location to determine its accuracy through a survey of several distant landmarks. I identified 44 of them, as my calculations indicated that I would need that many data points to determine accuracy with any level of confidence. My plan was to find an observation point and measure the bearing in degrees (0 is north, 90 east, 180 south and 270 west) from my position to the various landmarks. Then I would move to a second spot, remeasure, run the numbers and be done with it.

Well, when i arrived I quickly realized I had a couple of problems. The first was that I could not observe very many of the landmarks from any one position. In fact when all was said and done, I had to survey from nine different points just to collect two bearings on each of the landmarks. Then as I approached the first observation point, my GPS unit's batteries wore out, removing my ability to directly determine my own position. Guess who forgot to bring extra batteries?

Not wanting to drive all the way back to town, I revised my approach, and from my first point (1) I measured and recorded the bearings (as indicated on my hopefully still-accurate compass) to the landmarks (denoted as A, B, C, D, ... X, Y, Z, AA, BB, ...RR) that I could observe. From there I moved north a distance "d" to point (2) and again recorded bearings. From there, as shown below, I repeated this process every time moving the same distance d east to (3), south to (4), south again (5), west (6), west again (7), north (8), and finally north one more time (9), putting me NW of my starting point.

My measurements are in the (rather lengthy) table below. From these bearings I determined (gratefully) that the compass had maintained both its functionality and accuracy. Using them, you should also be able to deduce and see the location of my starting point.

Good luck! You can check your solution here: