1. Only surface search radar has a display. If you are equipped only with SD air search radar, neither radar display will be functioning. (However, I believe some surface search radar in the game incorrectly returns air contacts.)
2. The buttons on the toolbar to jump to a display are reversed. The "clock face" display is PPI, while the "heart monitor" display is A-scope. The PPI display (think classic movie radar) was developed later in the war and appears to be available too early in game. For the majority of the war, radar used an A-scope type display.
The A-scope represents a slice of radar energy directed down the axis of the radars current facing (rotate radar manually with the HOME and END keys). The three lines represent different range scales (from the top: short, medium, long beginning) and the numbers on the lines are the range in hundreds of yards (or maybe meters considering the state of the game).
You can change the active range display by toggling one of the switches beneath the display. You determine bearing by rotating the radar until you see a contact. (But here the game is lame and you are not given any indication of bearing on the display.) Contacts are represented by "spikes" in the horizontal flat lines. The height of the spike is an indication of the size of the contact (or at least I think it is). Where this spike occurs along the active line is an indication of range.
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-AKD
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