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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html>
<html>
<head>
<title>SR-71 - Section IV: Navigation and Sensor Equipment</title>
<link type="text/css" rel="stylesheet" href="sr71.css"></link>
</head>
<body>
<section id="ans">
<h1>Astroinertial Navigation System (ANS) Tape 12</h1>
<p>The ANS is an inertial navigation system employing a star tracker to eliminate gyro drift and to limit position error. The system provides a steering signal to the autopilot for guiding the aircraft automatically along a predetermined flight path. It provides heading, attitude, and position information to cockpit displays. The ANS can control the CAPRE side-looking radar and technical objective cameras for imaging operations. The ANS supplies navigational data to the electromagnetic - reconnaissance sensor and mission data to the mission recorder system. See <a href="#fig-4-1">Figure 4-1</a> for an ANS functional diagram.</p>
<figure id="fig-4-1">
<img src="images/4-1.jpg" alt="" />
<figcaption>Figure 4-1: Navigation and Sensor Control System</figcaption>
</figure>
<section>
<h3>System Interfaces</h3>
<p>The ANS provides signals for aircraft systems as seen in <a href="#fig-4-1">Figure 4-1</a>. The following equipment is either controlled by or receives inputs from the ANS:</p>
<ol class="list-number">
<li>
<p>DAFICS (for Autopilot and SAS analytical redundancy (ANR)).</p>
</li>
<li>
<p>Attitude Indicators (Pilot and RSO).</p>
</li>
<li>
<p>Flight Director Computer.</p>
</li>
<li>
<p>Horizontal Situation Indicator (Pilot).</p>
</li>
<li>
<p>Bearing, Distance, Heading Indicator (RSO).</p>
</li>
<li>
<p>Mission Recorder System.</p>
</li>
<li>
<p>EIP.</p>
</li>
<li>
<p>Technical Objective Cameras (in AUTO).</p>
</li>
<li>
<p>Optical Bar Camera</p>
</li>
<li>
<p>V/H System.</p>
</li>
<li>
<p>Viewsight.</p>
</li>
<li>
<p>Radar, including the RCD (controlled when in AUTO).</p>
</li>
<li>
<p>RSO Annunciator Panel.</p>
</li>
<li>
<p>Pilot Annunciator Panel.</p>
</li>
<li>
<p>Sensor time counter driver.</p>
</li>
<li>
<p>Peripheral Vision Display (PVD).</p>
</li>
</ol>
</section>
<section>
<h3>Modes of Operation</h3>
<p>The navigation system has four navigation modes: (1) astro inertial, (2) inertial only, (3) air start (airspeed-damped astro inertial), and (4) dead reckoning. <a href="#fig-4-2">Figure 4-2</a> summarizes the navigational errors expected in each mode. The mode to be employed depends on the time for activation and alignment, and whether the aircraft is on the ground or airborne when the ANS is turned on. Astro inertial is the preferred mode.</p>
<h4>ASTRO INERTIAL Mode</h4>
<p>In this mode, navigation errors will be relatively small, depending on the alignment method, and do not increase with mission duration. As soon as the system begins navigating the star tracker automatically begins to search for stars. Stars are normally tracked at night and during the day provided good sky conditions exist. A 61 star catalog is stored in the ANS computer. Either normal or special coverage for the SR-71B trainer can be provided. The sun, moon and planets are not used by the star-tracker. At least two different stars must be tracked for optimum performance. The star tracker measures the difference between the inertial platform orientation and celestial computed position. Data derived from stars is used to correct true heading, computed position, computed velocity, platform tilt, and gyro drift rates. Measured gyro drift rates are stored in the computer memory and are used to improve any subsequent inertial only navigation. This sequence eliminates the unbounded position error growth characteristic of pure inertial systems.</p>
<p>In a normal mission, either a rapid or gyro compassing alignment is performed prior to navigation. These alignments require 18 minutes and 36 minutes respectively, exclusive of warmup time. A ground hot start can be performed on a system previously aligned and shut down or on a system which has been shut down after operation in the astro inertial or inertial-only mode, provided the aircraft has not been moved. A runway heading alignment is recommended after a rapid alignment or a ground hot start. A heading update may or may not be required.</p>
<h4>INERTIAL-ONLY Mode</h4>
<p>INERTIAL-ONLY mode, in which only the inertial portion of the astroinertial system is employed, is recommended when the star-tracking capability of the navigation system is impaired. In this mode, navigation errors are unbounded.</p>
<h4>AIRSTART Mode</h4>
<p>The airspeed-damped, astro inertial (air start) mode, which uses both the inertial platform and star tracker, is intended for: (1) scramble-initiated flights when the system is not prepared for a ground hot start, and (2) restart in flight. In this mode, errors can be large at first but should damp down with time to the values in <a href="#fig-4-2">Figure 4-2</a>. Dead reckoning data are used for present position until three different stars have been acquired (steady illumination of the star ON light). Star acquisition is critical for accurate navigation.</p>
<h4>Dead Reckon Mode (DR)</h4>
<p>If the ANS inertial platform fails, navigation may continue using dead reckoning. In DEAD RECKON mode the ANS computer navigates using heading from the INS, true airspeed from the DAFICS (M computer) and inflight winds filled by the RSO. Position error increases proportional to errors in these inputs.</p>
</section>
<section>
<h3>System Errors</h3>
<p>
<span>Error values in <a href="#fig-4-2">Figure 4-2</a> are based on the high altitude flight profiles. Abnormal flight profiles (low-altitude, race-track, touch-and-go, etc.,) may result in errors in excess of the listed values. The error values listed are probable radial errors (CEP's); therefore, under normal system operation, the listed errors will be exceeded about half the time. When star tracking is lost, a residual position error may develop that will not be totally eliminated when star tracking resumes. It might take as many as</span>
<u>3 navigation position updates</u>
<span>(depending on Schuler cycle period) and a steady C star light to eliminate the total residual error.</span>
</p>
<table border="1" id="fig-4-2">
<caption>Figure 4-2: Navigation Mode Probable Radial Error</caption>
<thead>
<tr>
<td rowspan="2">
<p>NAVIGATION MODE</p>
</td>
<td colspan="4">
<p>ALIGNMENT METHOD</p>
</td>
</tr>
<tr>
<td>
<p>GRD HOT START</p>
</td>
<td>
<p>RAPID</p>
</td>
<td>
<p>AIR START</p>
</td>
<td>
<p>GYROCOMPASS</p>
</td>
</tr>
</thead>
<tbody>
<tr>
<td>
<p>
<span>ASTRO INERTIAL</span>
<u>/4\/3\</u>
</p>
</td>
<td>
<p>1.0 nmi</p>
</td>
<td>
<p>
<span>0.3 nmi (up to 10 hrs)</span>
<u>/5\</u>
</p>
</td>
<td>
<p>—</p>
</td>
<td>
<p>0.3 nmi (up to 10 hrs)</p>
</td>
</tr>
<tr>
<td>
<p>
<span>INERTIAL ONLY</span>
<u>/1\</u>
</p>
<p>(with fixpoints every hour)</p>
</td>
<td>
<p>5.0 nmi/hr</p>
</td>
<td>
<p>2 nmi/hr</p>
<p>1.28 nmi</p>
</td>
<td>
<p>—</p>
</td>
<td>
<p>2 nmi/hr</p>
<p>1.28 nmi</p>
</td>
</tr>
<tr>
<td>
<p>AIR START</p>
<p>(without fixpoints)</p>
<p>
<span>(with 2 fixpoints in first hr 20 ± 5 min apart)</span>
<u>/1\</u>
</p>
</td>
<td>
<p></p>
<p>—</p>
<p>—</p>
</td>
<td>
<p></p>
<p>—</p>
<p>—</p>
</td>
<td>
<p></p>
<p>after 2 hrs: 1.75 nmi</p>
<p>after 1 hr: 1.25 nmi</p>
</td>
<td></td>
</tr>
<tr>
<td>
<p>DEAD RECKONING</p>
</td>
<td colspan="4">
<p>
<u>/2\</u>
<span>55 nmi/hr (Depends on INS and DAFICS accuracy)</span>
</p>
</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="5">
<p>
<u>/1\</u>
<span>Using fixpoints ascertained to 1-nmi accuracy</span>
</p>
<p>
<u>/2\</u>
<span>No alignment required - Accuracy only as good as inputs (W/V, Hdg, MV, TAS)</span>
</p>
<p>
<u>/3\</u>
<span>Without continuous star tracking, errors approaching inertial operation can develop</span>
</p>
<p>
<u>/4\</u>
<span>With current accelerometer null bias calibration</span>
</p>
<p>
<u>/5\</u>
<span>With heading entry accurate to 0.1 degree</span>
</p>
</td>
</tr>
</tfoot>
</table>
</section>
<section>
<h3>System Components</h3>
<p>The navigation system has three major assemblies: the control and display panel, the portable chronometer, and the guidance group. The control and display panel (<a href="#fig-4-3">Figure 4-3</a>), located on the aft cockpit right console, is used to activate the system, select modes of operation, insert and monitor navigational data, modify the mission flight plan, and observe operating status.</p>
<p>A portable chronometer, in the aft cockpit supplies Greenwich Mean Time (GMT) (accurate to one-hundredth of a second) and the Julian date to establish the orientation of the Earth in inertial space for astro-inertial operations. The chronometer is set in the base shop, using a time standard set up to receive WWV time signals. Day can be set up to 511, thus allowing use of the computer star catalog into the next calendar year. A fully-charged, self-contained battery permits timekeeping for up to 24 hours without other power. Chronometer outputs are enabled only when aircraft power is applied. There is a GO, NO-GO indicator on the chronometer. GO indicates that either external or battery power is available and that the chronometer is operable, but does not indicate that the correct day and time is set. NO-GO indicates that chronometer outputs are unreliable.</p>
<p>The guidance group contains the electronic and optical-mechanical equipment for navigation and avionics subsystems control. The guidance group is mounted in the fuselage aft of the rear cockpit to provide an upward 78-degree cone of vision for the star-tracking telescope. The axis of the cone is vertical when the aircraft pitch angle is 7-1/2 degrees. The guidance group includes an inertially stabilized platform and associated electronic and electromechanical components required to control (1) its attitude, (2) a star-tracking telescope, and (3) the electronic and electromechanical components for pointing, servo-controlling, and discrimination of telescope photo-detections. A digital computer computes auto-navigation, guidance and avionics control, and maintains a continuously updated account of navigational status and coordinate values. The computer also stores instrument and mathematical coefficients, predetermined data references that define stars, and the mission flight plan. The computer initiates and evaluates self-tests periodically throughout the operating interval. Software corrections to the star data are provided for: (1) the shock wave over the window that refracts the star light and (2) pressure and temperature gradients (differentials) acting on the window causing optical lens effects.</p>
</section>
<section data-title="Navigation Control/Display Panel">
<h3>Navigation Control and Display Panel (NCD)</h3>
<p>The NCD (<a href="#fig-4-3">Figure 4-3</a>) on the aft cockpit right console controls the ANS.</p>
<div class="note">
<p>The positions of the ANS controls and the last push-button operations are recorded once each 0.832 seconds by the MRS. Events can be marked by using the ANS keyboard.</p>
</div>
<figure id="fig-4-3">
<img src="images/4-3.jpg" alt="" />
<figcaption>Figure 4-3: Navigation Control and Display Panel</figcaption>
</figure>
<table border="1">
<tbody>
<tr>
<td>
<p>1</p>
</td>
<td>
<p>Present Position Windows</p>
</td>
</tr>
<tr>
<td>
<p>2</p>
</td>
<td>
<p>Temperature Monitor Lights</p>
</td>
</tr>
<tr>
<td>
<p>3</p>
</td>
<td>
<p>Time-To-Turn Window</p>
</td>
</tr>
<tr>
<td>
<p>4</p>
</td>
<td>
<p>HOT/TACAN Switch</p>
</td>
</tr>
<tr>
<td>
<p>5</p>
</td>
<td>
<p>Malfunction Light</p>
</td>
</tr>
<tr>
<td>
<p>6</p>
</td>
<td>
<p>RAPID/RECALL Switch</p>
</td>
</tr>
<tr>
<td>
<p>7</p>
</td>
<td>
<p>Range to Destination Point Window</p>
</td>
</tr>
<tr>
<td>
<p>8</p>
</td>
<td>
<p>Next Destination Point Window</p>
</td>
</tr>
<tr>
<td>
<p>9</p>
</td>
<td>
<p>Dim Switch</p>
</td>
</tr>
<tr>
<td>
<p>10</p>
</td>
<td>
<p>Selected Data Windows</p>
</td>
</tr>
<tr>
<td>
<p>11</p>
</td>
<td>
<p>MODE Window</p>
</td>
</tr>
<tr>
<td>
<p>12</p>
</td>
<td>
<p>MODE Switch</p>
</td>
</tr>
<tr>
<td>
<p>13</p>
</td>
<td>
<p>MODE START Switch</p>
</td>
</tr>
<tr>
<td>
<p>14</p>
</td>
<td>
<p>DATA Switch</p>
</td>
</tr>
<tr>
<td>
<p>15</p>
</td>
<td>
<p>MAG/GRID Switch</p>
</td>
</tr>
<tr>
<td>
<p>16</p>
</td>
<td>
<p>UPDATE Switch</p>
</td>
</tr>
<tr>
<td>
<p>17</p>
</td>
<td>
<p>ENTER/DISPLAY Switch</p>
</td>
</tr>
<tr>
<td>
<p>18</p>
</td>
<td>
<p>C/TEST Switch</p>
</td>
</tr>
<tr>
<td>
<p>19</p>
</td>
<td>
<p>SKIP TO Switch</p>
</td>
</tr>
<tr>
<td>
<p>20</p>
</td>
<td>
<p>LOOK THRU Switch</p>
</td>
</tr>
<tr>
<td>
<p>21</p>
</td>
<td>
<p>DP/TURN Switch</p>
</td>
</tr>
<tr>
<td>
<p>22</p>
</td>
<td>
<p>DELETE Switch</p>
</td>
</tr>
<tr>
<td>
<p>23</p>
</td>
<td>
<p>DIRECT STEER Switch</p>
</td>
</tr>
<tr>
<td>
<p>24</p>
</td>
<td>
<p>BACK SPACE Switch</p>
</td>
</tr>
<tr>
<td>
<p>25</p>
</td>
<td>
<p>MANUAL CLEAR Switch</p>
</td>
</tr>
<tr>
<td>
<p>26</p>
</td>
<td>
<p>Manual Keyboard and Position Prefix Reference Switches</p>
</td>
</tr>
<tr>
<td>
<p>27</p>
</td>
<td>
<p>Sensor Operation Indicator Lights</p>
</td>
</tr>
<tr>
<td>
<p>28</p>
</td>
<td>
<p>Wind Direction and Wind Velocity Windows</p>
</td>
</tr>
</tbody>
</table>
<h4>MODE Switch</h4>
<p>The rotary MODE switch has seven positions:</p>
<dl>
<dt>OFF</dt>
<dd>Power is off except illumination power and chronometer power.</dd>
<dt>WARM UP</dt>
<dd>Power to temperature control circuitry and the computer.</dd>
</dl>
<p>The following five modes are called "operate" modes, since power is applied to the entire ANS. Operation begins only after the MODE START, RAPID, or HOT switch is pressed.</p>
<dl>
<dt>ALIGN</dt>
<dd>Used on the ground to remain in fine alignment or for ground alignment correct procedure.</dd>
<dt>ASTRO INERTIAL</dt>
<dd>Selects astro-inertial navigation.</dd>
<dt>INERTIAL ONLY</dt>
<dd>Selects inertial-only navigation.</dd>
<dt>DEAD RECKON</dt>
<dd>Selects dead-reckon navigation.</dd>
<dt>AIR START</dt>
<dd>Used to perform a cold air start (in-flight alignment) which results in airspeed damped, astro inertial navigation.</dd>
</dl>
<p>The MODE switch has a detent that prevents switching to OFF or WARM UP from an "operate" mode without lifting the switch. A detent prevents moving the switch clockwise past AIR START.</p>
<h4>MODE START Switch</h4>
<p>After power on, pressing MODE START initiates a gyrocompass or cold air start alignment. After alignment, pressing the self-illuminated switch enables the mode selected by the MODE and MAG/GRID switches.</p>
<h4>MAG/GRID Switch</h4>
<p>The MAG/Grid switch is an alternate-action switch. Either the MAG or GRID half of the switch is lighted at all times. The ANS computer interrogates this switch each time the MODE START switch is pressed.</p>
<p>Set the switch to MAG. There is no usable grid heading available to either cockpit with the SKN-2417 INS in normal operation. The ANS computer interprets the INS heading input as MAG heading and makes appropriate computations to provide a true heading value for the dead-reckoning reference frame.</p>
<h4>DATA Switch</h4>
<p>The rotary DATA switch is used to select a panel fill, update, display, or mission modification procedure. The position of the switch determines the first character (always alphabetical) of the SELECTED DATA (SD) window that expects data. The eight DATA switch positions are PRES POSITION, TIME, HEADING, NORMAL, DEST POINT, FIX POINT, CONT PT, and TEST.</p>
<h4>Keyboard Switches</h4>
<p>The ten numerical keyboard switches, labeled 0 through are used to enter data into the ANS or to command display of ANS data.</p>
<h4>MAN CLEAR Switch</h4>
<p>Used to clear the SELECTED DATA windows if an error is made during a panel-initiated procedure, and to not use an ANS position, altitude, or runway-heading alignment update. It is also used in the ANS malfunction routines.</p>
<h4>ARROW (Backspace) Switch</h4>
<p>Used to erase filled data one digit at a time in reverse order prior to actuating an action switch such as ENTER.</p>
<h4>LOOK THRU Switch</h4>
<p>Used to display data pertaining to the destination point (DP) after the DP now approaching.</p>
<h4>SKIP TO Switch</h4>
<p>Used to command the ANS to skip to a selected DP from the current next DP.</p>
<h4>RAPID/RECALL Switch</h4>
<p>Used to select rapid ground alignment or to recall data for display of the previously panel-filled TACAN point.</p>
<h4>DELETE Switch</h4>
<p>Used to delete a particular panel-filled mission point from the 40-List of panel-filled points or the entire 40-List.</p>
<h4>DIR STEER Switch</h4>
<p>Used to make an immediate change in destination (direct steer) to a selected DP or to any panel-entered latitude and longitude.</p>
<h4>HOT/TACAN Switch</h4>
<p>Used to mark the time of reading current TACAN data and to freeze the ANS computed values of range and bearing or to select air or ground hot starts.</p>
<h4>ENTER/DISPLAY Switch</h4>
<p>Used to command the ANS computer to accept panel-filled data or to display selected data.</p>
<h4>UPDATE Switch</h4>
<p>Commands the ANS to correct computed position, heading, reinitialize the star tracker, or change the current track leg.</p>
<h4 id="ncd-dp-turn-switch">DP/TURN Switch</h4>
<p>This push-button switch selects the source for the pilot's HSI range indicator. The DP/TURN switch is enabled when the ANS DATA switch is in TEST; pressing ENTER/DISPLAY will then illuminate the "DP" or "TURN" legend in the switch (corresponding to the mode presently selected); pressing the DP/TURN switch will change the mode and illuminate the other legend. When "DP" is illuminated, the pilot's HSI range indicator will read distance to the ANS destination point (DP); when "TURN" is illuminated, the pilot's HSI range indicator will read distance to the ANS-computed turn point. Refer to <a href="1.htm#hsi-range-indicator">Horizontal Situation Indicator, Range Indicator, Section I</a>.</p>
<h4>C/TEST Switch</h4>
<p>Used to perform a panel light test and to display ANS tape data and internal ANS conditions when used in conjunction with the TEST position of the DATA switch.</p>
<h4>SELECTED DATA Indicators</h4>
<p>The indicators or windows consist of six separate sets of digital displays. Various operating parameters are displayed in the indicators during the panel fill, mission modification, update, and alignment routines as shown in <a href="#fig-4-4">Figure 4-4</a>.</p>
<table border="1" id="fig-4-4">
<caption>Figure 4-4: Data in Selected Data Windows for Panel Routines</caption>
<tbody>
<tr>
<td class="split-header">
<p>SELECTED DATA WINDOW</p>
<p>PANEL ROUTINE</p>
</td>
<td>
<p>1</p>
</td>
<td>
<p>2</p>
</td>
<td>
<p>3</p>
</td>
<td>
<p>4</p>
</td>
<td>
<p>5</p>
</td>
<td>
<p>6</p>
</td>
</tr>
<tr>
<td>
<p>RUNWAY HEADING ALIGNMENT</p>
</td>
<td>
<p>Computed runway true heading, XXX°XX.X'</p>
</td>
<td></td>
<td></td>
<td>
<p>Filled runway true heading, XXX°XX.X'</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>FILL PRESENT POSITION AND INITIAL ALTITUDE</p>
</td>
<td>
<p>latitude, N/S XX XX.XX'</p>
</td>
<td></td>
<td>
<p>Altitude in hundreds of feet, XXX</p>
</td>
<td>
<p>longitude E/W XXX°XX.XX'</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>FILL WIND</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>Wind direction XXX°</p>
</td>
<td>
<p>Wind speed in Knots, XXX</p>
</td>
</tr>
<tr>
<td>
<p>FILL DAY AND TIME</p>
</td>
<td>
<p>GMT,</p>
<p>XX hours</p>
<p>XX Minutes</p>
<p>XX seconds</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>Julian day, XXX</p>
</td>
</tr>
<tr>
<td>
<p>FILL MAGNETIC VARIATION</p>
</td>
<td></td>
<td></td>
<td></td>
<td>
<p>Magnetic variation. E/W XXX°XX.X'</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>FILL CHART CONVERGENCE FACTOR</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>Chart convergence factor X.XXX°</p>
</td>
</tr>
<tr>
<td>
<p>UPDATE HEADING</p>
</td>
<td></td>
<td></td>
<td></td>
<td>
<p>Heading XXX°XX.X'</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>UPDATE PRESENT POSITION, USING REMOTE SOURCE DATA</p>
</td>
<td>
<p>North-South error, nautical miles, N/S OOXX.XX</p>
</td>
<td></td>
<td></td>
<td>
<p>East-West error, nautical miles, E/W OOO XX.XX</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>UPDATE PRESENT POSITION USING RADAR</p>
</td>
<td>
<p>North-South error, nautical miles, N/S XX.XX</p>
</td>
<td></td>
<td></td>
<td>
<p>East-West error, in nautical miles, E/W XX.XX</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>UPDATE PRESENT POSITION, USING VIEWSIGHT</p>
</td>
<td>
<p>North-South error, nautical miles, N/S XX.XX</p>
</td>
<td></td>
<td></td>
<td>
<p>East-West error, nautical miles, E/W XX.XX</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>UPDATE PRESENT POSITION USING TACAN</p>
</td>
<td>
<p>North-South error, in nautical miles, N/S XX.XX</p>
</td>
<td></td>
<td></td>
<td>
<p>East-West error, in nautical miles, E/W XX.XX</p>
</td>
<td></td>
<td></td>
</tr>
<tr>
<td>
<p>UPDATE TRACK LEG</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>All five digits of point - ID code, D XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DIRECT STEER</p>
</td>
<td>
<p>Latitude if new point is filled. N/S XX°XX.XX'</p>
</td>
<td></td>
<td></td>
<td>
<p>Longitude if new point is filled, E/W XXX°XX.XX'</p>
</td>
<td></td>
<td>
<p>All five digits of point - ID code if DP in memory if selected, D XXXX</p>
</td>
</tr>
<tr>
<td>
<p>SKIP TO DP</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>All five digits of point - ID code, D XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DELETE FP, CP, DP</p>
</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<p>All five digits of point deleted D XXXX C/C1XXXX F/F1XXXX</p>
</td>
</tr>
<tr>
<td>
<p>ADD OR REPLACE FP, CP, DP</p>
</td>
<td>
<p>Latitude, N/S XX°XX.XX'</p>
</td>
<td></td>
<td>
<p>Terrain elevation in hundreds of feet for CP's or FP's XXX.</p>
<p>Turn radius in nmi for DP's.</p>
</td>
<td>
<p>Longitude E/W XXX°XX.XX'</p>
</td>
<td>
<p>L/RXX.O SLR code or L/ROO.O for CP, FP or E/W XX.X' mag var for TACAN FP's</p>
</td>
<td>
<p>Point ID Code D XXXX C/C1XXXX F/F1XXXX</p>
</td>
</tr>
<tr>
<td>
<p>NORMAL DISPLAY</p>
</td>
<td>
<p>GMT in XX hours, XX mins, XX seconds</p>
</td>
<td>
<p>True airspeed in knots TXXXX</p>
</td>
<td>
<p>Next FP No, F/F1XXXX</p>
</td>
<td>
<p>Aircraft cross track position. nautical miles L/R XXX.X</p>
</td>
<td>
<p>Aircraft Ground Speed in Knots GXXXX</p>
</td>
<td>
<p>Next CP No. C/C1XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY NEXT FP, CP, OP</p>
</td>
<td>
<p>Latitude, N/S XX°XX.XX'</p>
</td>
<td>
<p>Range to DP RXXX.X nmi slant range</p>
<p>If TACAN FP SXXX.X nmi along track range to CP/FP AXXX.X nmi</p>
</td>
<td>
<p>Turn radius to DP KXXX nmi terrain elev for CP, FP hundreds of feet XXX</p>
</td>
<td>
<p>Longitude E/W XXX°XX.XX'</p>
</td>
<td>
<p>Relative bearing to DP, CP, FP L/R XXX.X°</p>
<p>TACAN bearing to TACAN FP BXXX.X°</p>
</td>
<td>
<p>ID Code of next point, D XXXX C/C1XXXX F/F1XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY SELECTED FP, CP, DP</p>
</td>
<td>
<p>Altitude N/S XX°XX.XX'</p>
</td>
<td>
<p>Great circle range for CP, DP, FP AXXX.X nmi</p>
<p>slant range if TACAN FP SXXX.X nmi</p>
</td>
<td>
<p>Turn radius if DP KXXX nmi terrain elev</p>
<p>If CP, FP, hundreds of feet EXXX</p>
</td>
<td>
<p>Longitude E/W XXX°XX.XX'</p>
</td>
<td>
<p>Relative bearing to point L/R XXX.X°</p>
<p>Magnetic bearing if TACAN FP 8XXX.X°</p>
</td>
<td>
<p>Selected point ID code, D XXXX C/C1XXXX F/F1XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY HEADING</p>
</td>
<td>
<p>Velocity vector heading VXXX°XX.X'</p>
</td>
<td>
<p>Grid heading GXXX.X°</p>
</td>
<td>
<p>Chart convergence factor CX.XXX</p>
</td>
<td>
<p>Aircraft true heading TXXX°XX.X'</p>
</td>
<td>
<p>Magnetic variation E/W XXX.X°</p>
</td>
<td>
<p>Magnetic heading MXXX</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY DAY OF YEAR/STAR DATA</p>
</td>
<td>
<p>GMT in XX hours, XX mins, XX seconds</p>
</td>
<td>
<p>Star number SXX</p>
</td>
<td>
<p>Scan Rate Code R X</p>
</td>
<td>
<p>Time in this star search T XX:XX min:sec</p>
</td>
<td>
<p>Number of stars acquired AXXXX</p>
</td>
<td>
<p>Julian day of year DXXX (1-511)</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY PRESENT POSITION</p>
</td>
<td>
<p>Latitude of alternate present position frame, N/S XX°XX.XX'</p>
</td>
<td></td>
<td>
<p>Nav altitude in hundreds of feet, AXXX</p>
</td>
<td>
<p>Longitude of alternate present position frame, E/W XXX°XX.XX'</p>
</td>
<td>
<p>Sun angle in degrees, (if positive) SXX.X°</p>
</td>
<td></td>
</tr>
<tr>
<td>
<p>DISPLAY LOOK THRU</p>
</td>
<td>
<p>Latitude of DP+1 N/SXX°XX.XX'</p>
</td>
<td>
<p>Along track range to DP+1 R XXXX nmi</p>
</td>
<td>
<p>Turn radius of DP+1 K XXX nmi</p>
</td>
<td>
<p>Longitude of DP+1 E/W XXX°XX.XX'</p>
</td>
<td>
<p>Time to DP+1 TXXX.X min</p>
</td>
<td>
<p>DP+1 ID No. D XXXX</p>
</td>
</tr>
<tr>
<td>
<p>DISPLAY TAPE NUMBERS/TEST</p>
</td>
<td>
<p>I TTMMCC</p>
<p>T • Tape</p>
<p>M • Mod</p>
<p>C • Corr</p>
</td>
<td>
<p>Mission tape No. OXXX 0•*</p>
<p>or</p>
<p>A thru Z</p>
<p>or</p>
<p>a thru e</p>
</td>
<td>
<p>General Instrument constants tape NO. GXXX</p>
</td>
<td></td>
<td>
<p>TYY1 (Normal)</p>
<p>TYY2 (Trainer)</p>
<p>Where YY=year</p>
</td>
<td>
<p>Test 0 Indication T 0</p>
</td>
</tr>
</tbody>
</table>
<h4>Present Data Indicators</h4>
<p>The PRESENT LATITUDE and PRESENT LONGITUDE windows show the present position coordinates in degrees and minutes. During ground alignment, the coordinates are blank until fine alignment is completed.</p>
<p>The WIND DIR and WIND VEL window displays the wind direction in degrees and the wind velocity in knots. The window displays zeros until airborne.</p>
<p>The TIME-TO-TURN window displays the time-to-turn in hours, minutes, and seconds. The window is blank until the aircraft is moving.</p>
<p>The RANGE TO DP window displays the range to the DP in nautical miles. The window is blank until present position coordinates are entered.</p>
<p>The NEXT DP window displays the next destination point number. The window is blank until the present position coordinates are entered.</p>
<h4>Sensor Indicators</h4>
<p>The TECH L and R, and SLR indicator lights illuminate during display of control points or fix points to indicate programmed sensor activity at the selected point. The SLR light is not illuminated during display of viewsight fixpoints. During NORMAL display, these lights illuminate during actual ANS on-time commands and are extinguished by standby control point commands. The lights do not illuminate during manual sensor operation.</p>