TM 1-1520-238-10Change 33-59k. CDU Validity Checks For UTM CoordinateData.The CDU checks the parameters of all data en-tered through the scratchpad. Any non-valid charactersare flagged as erroneous. Valid parameters are as shownin table 3-19.Table 3-19.UTM Coordinate Data – Valid Entries ParameterValid EntriesGrid Zone1 – 60 for the first two characters. C – H, J – N and P – X for the third character.UTM IdentifierA – H, J – N and P – V for the most significant character.MagneticVariationE or W and 0 – 180.0 degrees.SpheroidAU, BE, EV, IN, C0, C6 and MA. MA is not currently utilized.Fly-To1 – 19 and H and 0. H and 0.are synonymous.l. LATT/LONG Coordinate Entries for WaypointDictionary.LATT/LONGcoordinates, including mag-netic variation, may be entered into the waypoint coordi-nates as a single character string. The following is a typi-cal format used when entering LATT/LONG coordinatesand magnetic variation.N7425.9W12057.6E10.5WhereN7425.9=74 degrees 25.9 minutesNorth LatitudeW12057.6=120 degrees 57.6 minutesWest LongitudeE10.5=10.5 degrees East MagneticVariationWhen LATT/LONG and magnetic variation are all en-tered, the required sequence is latitude, longitude, thenmagnetic variation.A complete entry of LATT/LONG coordinates and mag-netic variation data is not required under all circum-stances. Data entered in the scratchpad is always left jus-tified. The following rules apply when an incomplete set ofLATT/LONGcoordinates and magnetic variation data isto be entered into the CDU scratchpad.NOTELeading zeros are required when enteringdegrees or minutes of latitude and longi-tude, i.e., N0905.5W01010.3 represents anentry of 9 degrees 5.5 minutes North lati-tude and 10 degrees 10.3 minutes West lon-gitude.Rule 1 – Latitude Range of Degrees. South latitude rangefor entering degrees is 00 – 80 North latitude range for en-tering degrees is 00 – 84.Rule 2 – Longitude Range of Degrees. The range for en-tering degrees is 000 – 180.Rule 3 – Latitude Change. A change in latitude must beaccompanied by a change in longitude. Entry of magneticvariation is optional. If magnetic variation is not entered,its value defaults to the value associated with presentposition.Rule 4 – Magnetic Variation Change. A change can bemade to magnetic variation without changing LATT/LONGcoordinate data or affecting their values.m. LATT/LONG Coordinate Entries forPPOS.When an incomplete set of LATT/LONG coordi-nates and magnetic variation is entered into PPOS, thefollowing exception applies:NOTEA change in latitude must be accompaniedby a change in longitude. Magnetic variationremains unchanged.