<p>The map page is accessed by pressing the '#' key on the numeric keypad. It shows the whole Interdictor II world in nine sections. You can move between the map sections using keys 8, 2, 4 and 6 on the numeric keypad. These move you up, down, left and right respectively. You cannot move diagonally on the map page. The map also shows the state of enemy targets and the current position of enemy aircraft and trucks. You may set waypoints anywhere in the world using the map page; these are used for navigation when flying. Facilities for saveAoad state and selecting aircraft model are also provided on this page.</p>
<p>Each map is a section of the world approximately 50Km across. It shows topographic information e.g. mountains/rivers photographed by a reconnaissance aircraft flying at 37000M. Tactical information, i.e. the position of enemy vehicles, is show by overlaying small icons representing the type of vehicle on the map. The state of enemy target positions is also shown using the same technique.</p>
<p>As well as providing useful information the Map pages also allow waypoints to be set. Positioning a waypoint on the map (controls outlined below) results in the latitude and longitude of the waypoint being stored in the Interdictor II navigation computer. During flight the navigation computer uses this data together with inertial navigation data to calculate the range and bearing to each waypoint. This information is displayed on the Head Up Display and the Electronic Head Down Displays. There are three programmable waypoints (1,2,3); waypoint 0 is always set to your current base. Waypoints are used in two primary roles. Individually they mark targets to be destroyed. Two waypoints can be used together to set up an approach path to a runway, one is positioned a couple of Km from the end of the runway and the other over the runway.</p>
<p>The current state of gameplay can be saved/loaded from this page. The <Home> and <Copy> keys are used for this purpose.</p>
<p><font size="+1"><strong>Save State <Copy></strong> </font></p>
<p>This saves your current position in the world, the state of all enemy targets and also of all enemy vehicles. It effectively suspends the game allowing you to recommence play from the same position at a later time. You may only save the state of play when the Save (S) flag is showing.</p>
<p><font size="+1"><strong>Load State <Home></strong> </font></p>
<p>This loads the game state from disk. The Map display is updated to reflect the loaded game state. You may only load a state when the Load (L) flag is showing. The 'L' flag only shows at the start of a game.</p>
<p>The game state is saved in a file called 'state', to have multiple saved states use the RISC OS desktop to copy or rename the current state file.</p>
<p>Interdictor II has two aircraft models which you may fly. Selecting between them is accomplished using the <Space bar>. A brick/aircraft icon on the control bar shows the currently selected model.</p>
<p>This is exactly what the name suggests, it has all the aerodynamic features of a brick (none!). It is provided to allow easy exploration of the world and familiarisation with the controls and displays. The brick cannot be killed and has limitless supplies of fuel and weapons. However, once you have used the brick in any part of the game you will be unable to save the game state (that would be too easy!).</p>
<p><font size="+1"><strong>The Real Aircraft Model</strong> </font></p>
<p>This is a true force model of a jet powered fighter aircraft. See the Aerodynamics chapter for a full description of how to fly this model.</p>
<p>Status Display This shows you current progress through the world together with some statistical information relating to your performance. The nine sections of the world (Alpha-Iota) are shown in colour to indicate their current state.</p>
<ul>
<li> Blue - Friendly<br>
<li> Red - Hostile<br>
</ul>
<p>Also shown is; time taken, aircraft lost, and relative performance, which is your score.</p>
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<h4>Map Page Control Summary:</h4>
<ul>
<li> Keypad Enter: Starts the game<br>
</ul>
<p>Movement around the world maps:</p>
<ul>
<li> Keypad 8: up<br>
<li> Keypad 2: down<br>
<li> Keypad 4: left<br>
<li> Keypad 6; right<br>
<li> Keypad 0: show status page<br>
</ul>
<p>The Waypoints indicator is shown as a small square on the right edge of the status screen. You can cycle the waypoint numbers by clicking on this square or by pressing Keypad + or -. With a waypoint selected you can place or remove that waypoint.</p>
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<h4>Waypoint control</h4>
<ul>
<li> Keypad + select next waypoint<br>
<li> Keypad - select last waypoint<br>
<li> Left Mouse button - set selected waypoint to position at mouse pointer on map<br>
<li> Right Mouse button - clear selected waypoint<br>
