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The technician that works on it will give you a call. They will most likely be able to repair it as long as the instrument housing is in good shape. Take a look in this forum for instructions on how to replace an ST50 with an ST60. The wiring is simple. The only problem is the appearance of the nice new grey instrument in line with the old ST50 black.A ‘Software Upgrade’ is only suitable for systems where there are no more than TWO display units connected via HSB.Examples of systems where a software upgrade are appropriate are:- ONE or TWO station HSB system requiring the extra HSB2 Software features- System where an existing HSB display unit is to be connected to a HSB2 display unitCurrent Pathfinder products (see below table) when connected in an HSB system containing two or fewer displays can be upgraded to Pathfinder Plus via a software upgrade kit.Existing Pathfinder HSB Products:RL70/RL70RC RC520 L755RC*R70/R70RC RC530 L760RC*R80/R80RC RC631 L1250RL70C/RL70CRC L1250RCRL80C/RL80CRC* L755 and L760 units with 10 digit serial numbers (units manufactured prior to December 2000) must be returned for hardwaremodifications.* Units with 9 digit serial numbers will not require hardware upgrade unless they are used in a system consisting of more than TWO displays, hardware and software upgrade will be necessary.Software upgraded products will have the following enhancements which is a subset of the full HSB2/Pathfinder Plus features:- HSB2 networking capability on up to 2 displays – for transfer of radar, chart and sonar data.- Radar/Chart Overlay – provides direct correlation of radar targets and chart features, applicable to Colour display units ONLY- Day/Night screen control - applicable to Colour display units ONLY- Alphanumeric entry of Waypoint and Route data using the ST80 Navigator Keypad- Improved Waypoint and Route creation from the Waypoint listing- Smart RouteTM feature – converts track history into a ‘track-back’ route- GPS COG/SOG filter control – added to System Set-Up- Configuration of GPS via NMEA – GPS set-up/cold-start now transmitted on NMEA.- Addition of the MARPA Master function to the 7” Colour Radar display units ONLYBelow is a list of the part numbers for the software upgrade kits:-Please note HSB displays can be upgraded using an ‘unique’ C-Map NT cartridge applicable to each display family, i.e. 7" Colour LCD, as listed below, requiring a different cartridge for a particular software upgrade.-Radar/Chart’ or 'Chart only' displays, i.e. R70RC or RC530, are updated by inserting the upgrade cartridgein the top slot of the chart reader. 'Radar only' displays, which do not have a chart reader, can be upgraded by connecting the display via an HSB cable to another ‘Radar/Chart’, ‘Sonar/Chart’ or 'Chart only' display.-Also, the HSB2 Software Upgrade cartridge is a ‘one time’ software update, full Generic Software Upgrade Instructions (#84106_1) are contained within the software kits.Part Number Description:E55035 HSB2 Software Upgrade for RL70/RL70RC/RC520E55036 HSB2 Software Upgrade for RL70C/RL70CRC/RC530CE55037 HSB2 Software Upgrade for RL80C/RL80CRC, RC631E55038 HSB2 Software Upgrade for R70/R70RCE55039 HSB2 Software Upgrade for R80/R80RCE65001 HSB2 Software Upgrade for L755RCE65002 HSB2 Software Upgrade for L760RCE65003 HSB2 Software Upgrade for L1250/L1250RCThe kit can be ordered through any dealer or the Raymarine Order Services Desk. This is a chargeable item if a dealer does the software upgrade. Please visit the website at www.raymarine.com for a complete list of the dealers.Please note that the Radar overlay feature is only as functional as its heading input. A 10Hz heading input is recommended either from our M92649 active heading sensor or a type 150G or 400G course computer.