Transcript Document
ES Aircrew 2009 Update Training Programming the GX-55 For the BASIC Grid System U.S. AIR FORCE AUXILIARY Lt. Col. Stan Kegel Minnesota Wing April 2009 Parallel Line Search Pattern a.k.a. “Grid Search” “US Grids” are areas 15 minute to a side, serially numbered for each sectional chart (MSP means “Twin Cities” sectional) 7.5 minute quarter grids are named A, B, C, and D – in reading order, left to right, top to bottom 46 00’ N B A 414 D C 45 45’ MSP 413 A 445 446 45 30’ N 93 45’ 94 00’ W 93 30’ W The “Other” Grid System – BASIC Grids “BASIC Grids” are areas 1 degree to a side – – – The first two digits are the latitude of the SE corner The remaining digits are the longitude of the SE corner A slash or dash is often used to separate the latitude digits and longitude digits 30 minute quarter grids [or quadrants] are named A, B, C, and D – in reading order, left to right, top to bottom 15 minute sixteenth grids [or sub-quadrants] are named within each quarter grid A, B, C, and D. The full name of the sixteenth grid with a SE corner at 46 N 93 W would be “4693DD”. 47 00’ N 46/93 46/93 AA AB 46/93 46/93 AC AD 46/93C 46/93B 46 30’ 46/93D 46 00’ N 93 30’ 94 00’ W 93 00’ W Comparing the two grid systems Note that a BASIC sixteenth grid (or subquadrant) is the same size as a whole US Grid Parallel Line Search Pattern a.k.a. “Grid Search” The GPS unit labels the four corners (and also four search pattern entry points) 1, 2, 3, and 4 – clockwise starting in northwest. 1 2 47o 00’ N 46/93AA 4 94o 00’ W 3 93o 45’ W 46o 45’ N Describing a Parallel Line Pattern Grid identifier and starting waypoint (i.e. corner of quarter-grid) Track spacing Direction of tracks – either E/W or N/S Note: The search area for a parallel line pattern in the GX55 is always a quarter-grid when using US Grids. (It is either a quarter-grid or sixteenth-grid when using BASIC Grids.) Parallel Line Pattern Example Sixteenth Grid 44/93AA1 • Northwest corner of subquadrant 46/93AA Track spacing 2 NM Tracks running east to west 46/93AA Track spacing Setting up for the “Other” Grid System – BASIC Grids GRD POS First, go to the SAR map setup page, and press the GRD smart key to change the grid type to BASIC. Also, make sure the Position field is set to NW (as in North latitude, West longitude). Press the POS smart key to change this value. Setting up for the “Other” Grid System – BASIC Grids Next, while still viewing a map set-up page, turn the small knob to get the SAR Position Page*. SEL Press the SEL button to get a cursor so values can be changed**. Use the large knob to move the cursor and the small knob to change values. Change the Latitude and Longitude to represent the correct 10 degree by 10 degree area (i.e. less than and within 10 degrees of the area to be searched). ENTER Press Enter to accept the new values. * Note: This page is only reachable when the grid type is set to BASIC. Programming the Parallel Line Search Pattern for the “Other” Grid System Prerequisite: MAP The intended grid type (BASIC Grid), hemispheres (“NW”), and SAR Position (SE corner of the 10 degree by 10 degree area) must be configured under map setup. Press MAP to view map pages Turn large knob to view SAR map page PAT Press the PAT smart key If needed, turn the small knob to view the “Parallel Line Search Page” ENTER Press ENTER to begin Programming the Parallel Line Search Pattern for the “Other” Grid System SEL Press SEL to make cursor appear so that values can be edited Enter grid corner name*, spacing, and track direction – use large knob to move cursor and small knob to change values ENTER Press ENTER to accept values ENTER Press ENTER again to activate the search pattern PAT Press PAT to cancel search pattern * The grid number entered here is the last digit of the latitude followed by the last digit of the longitude of the SE corner. For example, to specify grid 46/93AA, with entry at the NW corner (i.e. corner “1”), first set the SAR Position in Map Setup to Lat. 40, Lon. 90, then on this page enter grid “63AA2” [as shown above]. Note that, in the case of BASIC grids, either a quarter grid (30’ x 30’), with one letter, or a sixteenth grid (15’ x 15’), with two letters, can be specified.