Projects:GCSHA - SHA2017 Geo Cache

Work in progress

This is Work in progress the bleutooth beacons have not yet been placed at their current location.

I plan to install them on Thursday 3rd of August.

GCSHA2017 - The 'Official' SHA2017 unofficial GeoCache

Welcome to the SHA2017 geocache. A geocache with a techie twist. Instead of looking for physical objects, you will be looking for the SSIDs of bluetooth beacons hidden on the SHA2017 campground

Your mission

Your mission, should you choose to accept it, it to find 15 hidden bluetooth modules. Each of these bluetooth modules will give you a letter and it's relative position to the previous letter. Those 15 will form a sentense that will allow you to have some fun at the end coordinates of the geocache trail.

Geocache properties

Starting coordinates: N 52° 17.047' E 5° 31.555'

Type: Multicache Difficulty : 2.5 Terrain: 2.5 Size: Other

Other properties:

• Fee to get in
• Available 24/7
• Camping
• Parking
• Picknick tables nearby
• Potable water nearby
• Public toilets nearby
• Phones nearby
• Requires special tools
• <10 KM walk
• Restaurant nearby
• Wireless transmitter
• Field puzzle
• Still Hacking Anyway

What do you need?

You will need some special equipment:

• Access to SHA2017
• A device to get your GPS coordinates and to find other GPS coordinates
• A device to show the SSIDs of BlueTooth Low Energy (BLE) devices around you

Luckily most smartphones actually have both properties.

GPS coordinate finder

Android: [1] - Use the 'Any Destination feature' iPhone: [2] Your GPS unit: RTFM

BLE scanner

Android: 4.0 Scanner iPhone: Scanner 4.0 The badge: Write one in mycropython.. ;)

How does it work

Below is an example of five waypoints. This is NOT the answer.

The first coordinate is given: N 52° 17.032' E 5° 31.521'

When you go here you open your bluetooth finder/scanner. (There is actually nothing there, this is an example.)

In the scanner you see the following SSID: GCSHA1-030-062+3S this SSID consits of 4 parts.

| GCSHA1 | -030 | -062 | +3S | | GCSHA indicates that this is a GCSHA beacon \ 1 indicates that this is waypoint 1| N coordinate hint | E coordinate hint | Letter hint |

In order to find waypoint 2 (WP2) you will need to add the N coordinate hint to the last three digits of the N coordinate and the E coordinate hint to the last three digits of the E coordinate.

N 52° 17.032' - 0.030' = N 52° 17.002
E  5° 31.521' - 0.062' = E  5° 31.459

You also need to place the letter in a grid of 5 letters.

| . | . | . | . | . | | 1 | 2 | 3 | 4 | 5 |

+3S indicates that you have to move 3 places to the right and place the S there:

| . | . | S | . | . | | 1 | 2 | 3 | 4 | 5 |

That's all the puzzling you need to do at WP1. You can now go to N 52° 17.002' E 5° 31.459' to find WP2 which reads: GCSHA2+045+016-2G

The next coordinate will thus be:

N 52° 17.002' + 0.045' = N 52° 17.047' 
E  5° 31.459' + 0.016' = E  5° 31.459'

-2G tells you to place the G two positions left of the last letter.

| G | . | S | . | . | | 1 | 2 | 3 | 4 | 5 |

Now, try to solve the puzzle when I give you the last three waypoint names:

||WP ||Name ||Coordinate ||Hint ||Letter hint || | 1 | GCSHA1-030-062+3S | N 52° 17.032' E 5° 31.521' | | +3S | | 2 | GCSHA2+045+016-2G | N 52° 17.002' E 5° 31.459' | | -2G | | 3 | GCSHA3-036+036+1C | | | | | 4 | GCSHA4+009-048+3A | | | | | 5 | GCSHA5+012+058-1H | | | | | End | N/A | | | |

| G | . | S | . | . | | 1 | 2 | 3 | 4 | 5 |

If you added everything up the right way the end coordintate schould be the starting coordinates that the five letters should spell something familiar. ;)

O.K., let's go!!!!

O.K. you are ready to go.

Here's a form that might help you : File:GCSHA2017 Form v1.pdf

Final checklist:

• Bluetooth Low Enegry scanner?
• GPS device?
• Batteries charged?
• Form printed?

Your starting coordinates are: N 52° 17.047' E 5° 31.555'