GPS Comparisons Auto
How can I get spare parts for my Altimaster? There are three ways to get spare Altimaster parts, including Neptune battery covers, Galaxy mounting screws, and more: If you have a mechanical Altimaster (Altimaster II, Altimaster III, or Altimaster III Galaxy), yes, this is normal. Most altimeters do NOT directly measure altitude, they measure barometric pressure. As you go higher in altitude the air pressure drops, and the altimeter mechanism reacts to the change in pressure by rotating the pointer.The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc.
Why have a barometric altimeter? Quite simply, the primary reason you would want a barometric altimeter in a handheld GPS is for more accurate elevation readings. This is especially useful for bikers, hikers and atheletes in training. You can use the resulting data to track your progress and maintain an accurate record of your trips. A barometric altimeter can also help you accurately place your location on a topo map. Furthermore, you can use the altimeter to forecast weather on the mAh rating of the batteries you use, and the update frequency you select you will get different run times.
How much power do the TX-units use? Depending on the mAh rating of the batteries you use, and the update frequency you select you will get different run times. As well, the radio can be put into 'serial sleep' mode which lowers its power consumption when not transmitting down to 5 ma. Setting the Radio to 'serial sleep' does help conserve battery power for applications where the update time is 10 seconds or more. The following examples assume and update frequency of 1 second.Quite simply, the primary reason you would want a barometric altimeter in a handheld GPS is for more accurate elevation readings. This is especially useful for bikers, hikers and atheletes in training. You can use the resulting data to track your progress and maintain an accurate record of your trips. A barometric altimeter can also help you accurately place your location on a topo map.
How can I get spare parts for my Altimaster? There are three ways to get spare Altimaster parts, including Neptune battery covers, Galaxy mounting screws, and more: If you have a mechanical Altimaster (Altimaster II, Altimaster III, or Altimaster III Galaxy), yes, this is normal. Most altimeters do NOT directly measure altitude, they measure barometric pressure. As you go higher in altitude the air pressure drops, and the altimeter mechanism reacts to the change in pressure by rotating the pointer.Some high-end GPS devices offer barometric pressure to obtain a measurement for elevation when signal reception is not very good. The result is that you will have a smoother elevation profile in the Dashboard and Map Player. Without an altimeter, the GPS assumes your elevation is not changing when the signal goes bad.
How accurate are the heights or depths? The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.
How much power do the TX-units use? Depending on the mAh rating of the batteries you use, and the update frequency you select you will get different run times. As well, the radio can be put into 'serial sleep' mode which lowers its power consumption when not transmitting down to 5 ma. Setting the Radio to 'serial sleep' does help conserve battery power for applications where the update time is 10 seconds or more. The following examples assume and update frequency of 1 second.The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.Now that SA (Selective Availability) has been turned off, the general answer to this is Yes. GPS altitude is at least as accurate as the reading from a barometric altimeter.