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Garmin GPSMAP 78 vs GPSMAP 62
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Past MnGCA Board

Joined: 30 Nov 2003

Posts: 1846

PostPosted: Sat Jun 26, 2010 7:37 pm    Post subject: Reply with quote

It is not surprising that you are getting errors on GPS 25, it was retired in late 2009 after 17 years in service (planned life span was 7.5 years).

GPS 25 is a Block II-A sat that was launched on 23 Feb 1992. The Block II included sats sequence number 23 through 40 and were launched between Nov 90 and Nov 97. The payload consisted of two L-band navigation signals at 1575.42 MHz (L1) and 1227.60 MHz (L2). Each spacecraft carried 2 rubidium and 2 cesium clocks and nuclear detonation detection sensors.

The Block II-A had a design life span on 7.5 years.

Block II-R (13 sats) started launches in 1997 and went through 2004. The Block II-RM started launches in 2005 through 2009 with 9 sats launched.

Block II-F first launch was on 28 May this year and there are 11 more scheduled for launch through 2013.

The first Block III is scheduled for 2014.

GPS 62 which is the first Block II-F launch (May of this year) will be replacing the signal on GPS 25 when it comes on line.
Airborne All the Way!
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